Open Source

Aiven is a Helsinki, Finland-based cloud data platform company founded in 2016 that provides fully managed open-source data services across all major cloud providers — AWS, Google Cloud, and Microsoft

Alluxio is a data orchestration platform that bridges compute and storage systems across hybrid cloud and on-premises environments, enabling high-performance data access for AI, machine learning, and

Almanac is an asynchronous work platform built for distributed and remote-first teams that need structured workflows for documentation, decisions, and collaboration without defaulting to synchronous m

Anaconda is a data science and artificial intelligence platform company founded in 2012 and headquartered in Austin, Texas. It is the creator and maintainer of the Anaconda Distribution — the world's

Ansible is an open-source IT automation framework originally created by Michael DeHaan in 2012 and acquired by Red Hat in 2015, which was itself acquired by IBM in 2019. Ansible was built to solve a f

Apache Cassandra is an open-source distributed NoSQL database management system designed for handling massive amounts of structured data across commodity servers, offering high availability, fault tol

Apache CouchDB is a free, open-source document-oriented NoSQL database — managed by the Apache Software Foundation — storing data as JSON documents, using HTTP/REST as its native API, and employing Ja

Apache Superset is an open-source business intelligence and data visualization platform originally created at Airbnb in 2015 by Maxime Beauchemin and donated to the Apache Software Foundation in 2017,

Apex.AI is an international software company that builds safety-certified, developer-friendly software for mobility systems — specifically software-defined vehicles (SDVs) and autonomous systems. Foun

Apollo GraphQL is a software infrastructure company founded in 2016 and headquartered in San Francisco, California. The company created and maintains the world's most widely used GraphQL client and se

AppFlowy is an open-source collaborative workspace application designed as a privacy-respecting alternative to Notion. Built with a local-first architecture, AppFlowy stores data on the user's own dev

Appsmith is an open-source low-code platform for building internal applications, admin panels, and operational tools by visually composing UI components connected to databases and APIs through a JavaS

Arena (formerly LMArena/Chatbot Arena) is the world's most widely used crowdsourced AI model evaluation platform, originated by UC Berkeley researchers and spun into an independent company in 2025. Mi

Argyle is an open finance infrastructure company that enables real-time, consumer-permissioned access to income, employment, and asset data through direct connections to payroll systems and HR platfor

Arrcus is a networking software company founded in 2016 by Devesh Agarwal and a team of veterans from Cisco, Juniper, and other networking incumbents, and headquartered in San Jose, California. The co

Artillery is a modern open-source load testing and smoke testing framework designed for cloud-native application architectures, offering a YAML-first test definition syntax that makes performance test

Athos Therapeutics is a clinical-stage biotechnology company founded in 2019 and headquartered in the United Kingdom. The company's platform integrates artificial intelligence, medicinal chemistry, an

Automattic was founded in 2005 by Matt Mullenweg, who is also a co-creator of the WordPress open-source project. The company operates as the commercial steward behind WordPress.com — the hosted bloggi

BangDB is a high-performance database company founded in 2015 and headquartered in Bengaluru, India, that develops a converged multi-model NoSQL database designed to natively support artificial intell

BentoML is a San Francisco-based AI infrastructure company that develops an open-source framework for packaging and deploying machine learning models as scalable API services, solving the persistent g

bit.bio is a synthetic biology company founded in 2016 as a spinout from the Luscher laboratory at the University of Cambridge, headquartered in Cambridge, United Kingdom. The company's core technolog

Bluesky is a decentralized social network built on the AT Protocol, an open standard designed to give users control over their data, identity, and feed algorithms. Originally incubated by Twitter and

Boston Metal is a green steel technology company that has developed Molten Oxide Electrolysis (MOE), a breakthrough electrochemical process that converts iron ore directly into liquid metal using elec

Botkube is a Kubernetes monitoring and collaborative troubleshooting tool that bridges the gap between cluster operations and team communication platforms. The platform runs as an agent inside a Kuber

BoxyHQ is an open-source enterprise security company founded in 2021 that builds foundational security and compliance components for SaaS applications. The company's flagship product Jackson provides

Brave Software is the developer of Brave Browser, a privacy-first web browser that blocks ads, trackers, and cross-site data collection by default. Founded in 2015 by Brendan Eich — the creator of Jav

Budibase is an open-source low-code platform founded in 2019 and headquartered in Belfast, UK. It is designed to help developers and technical teams build internal tools, admin panels, dashboards, and

Bump.sh is a Paris-based API documentation and change management platform founded in 2020 that addresses one of the most painful operational problems in API-driven development: communicating breaking

Cal.com is the leading open-source scheduling infrastructure platform, enabling businesses and developers to build appointment booking and calendar management into any application. Founded in 2021 and

Cerbos is an open-source authorization solution founded in 2021 that provides a centralized policy decision point for application access control, allowing engineering teams to define, manage, and test

Checkmk is a Munich, Germany-based IT monitoring platform developed by tribe29 GmbH that provides unified monitoring across on-premises servers, network devices, cloud infrastructure, containers, and

Chromatic is a visual testing and UI review platform built specifically for Storybook, the industry-standard component development environment, that automates visual regression detection by capturing

ClickHouse is the world's fastest open-source column-oriented database management system for real-time OLAP analytics. Originally developed at Yandex for web analytics at petabyte scale, ClickHouse wa

ClickHouse Cloud is the fully managed cloud service built on ClickHouse, the open-source columnar database originally developed at Yandex and now one of the fastest-growing analytical databases in the

Cloudsmith, founded in 2016 and headquartered in Belfast, is a cloud-native artifact management platform that stores, secures, and distributes every software component an organization produces or cons

Cockroach Labs is the company behind CockroachDB, a cloud-native distributed SQL database designed for globally distributed applications that require consistent transactions, high availability, and ho

Coder is an Austin-based developer infrastructure company that provides an open-source platform for cloud development environments (CDEs) — fully configured development workspaces running in the cloud

Coherence is a Stockholm-based multiplayer game development platform that dramatically lowers the barrier to building online multiplayer games for Unity developers by automatically generating the netw

Comma.ai is a San Diego-based automotive technology company founded in 2015 by George Hotz (who famously first jailbroke the iPhone and PS3), focused on developing accessible, open-source semi-autonom

CommonLit is a nonprofit educational technology organization that provides a free, comprehensive reading and literacy curriculum for students in grades three through twelve. Founded in 2012 and headqu

Conduktor is a London-based data streaming technology company founded in 2020 by Nicolas Hagopian and Clément Devesa. The company builds an enterprise management and governance layer on top of Apache

Consensys is the leading Ethereum software company, founded in 2014 by Joseph Lubin, one of the eight co-founders of the Ethereum blockchain. Headquartered in New York City with a global team, Consens

Coolify is an open-source, self-hostable platform-as-a-service that allows developers to deploy applications, databases, and third-party services on their own servers or cloud VPSs with the same conve

Corelight is a cybersecurity company founded in 2013 by Vern Paxson, Robin Sommer, and Seth Hall and headquartered in San Francisco, California. The company commercializes and extends Zeek (formerly k

CrateDB is a distributed SQL database engineered for high-ingestion machine data, IoT time series, and hybrid analytics workloads that combine structured records with JSON documents and full-text sear

Crowdin is a continuous localization platform developed in Kyiv, Ukraine that enables software development teams to maintain translations in sync with rapidly evolving codebases by connecting localiza

Cube is a semantic layer and headless business intelligence platform founded in 2019 and headquartered in San Francisco, California. The company was founded by Artyom Keydunov and Pavel Tiunov to solv

Cyclops is an open-source Kubernetes developer portal that allows platform engineering teams to create customizable, form-based deployment interfaces that abstract Kubernetes YAML and Helm chart compl

Dagster is an open-source data orchestration and pipeline development platform that reimagines how data pipelines are built by modeling data assets (tables, ML models, reports) explicitly rather than

Databend is an open-source, cloud-native data warehouse written entirely in Rust, designed to provide Snowflake-compatible SQL analytics at a fraction of the cost of proprietary cloud warehouses. Buil

Daytona is an open-source development environment manager built to standardize how development workspaces are created, configured, and accessed across an organization's entire infrastructure footprint

dbt Labs is a data transformation and analytics engineering company founded in 2016 and headquartered in Philadelphia, Pennsylvania, that created dbt (data build tool) — the open-source framework that

DevCycle is a developer-focused feature management platform built for teams that need reliable, real-time control over feature rollouts. Founded to address the performance bottlenecks common in legacy

Dremio is a data lakehouse platform that enables organizations to run high-performance SQL analytics directly on data stored in cloud object storage — Amazon S3, Azure Data Lake, and Google Cloud Stor

Dune Analytics is a blockchain data platform that makes on-chain data queryable through standard SQL in a collaborative, community-driven environment. The platform ingests transaction and event data f

Earthly is an open-source build automation framework that runs build steps inside containers, ensuring that builds produce identical results on developer laptops and in CI systems regardless of the un

Embrace is a mobile observability platform built specifically for iOS and Android applications, providing the session replay, performance monitoring, crash reporting, and network analytics that mobile

Emerald Cloud Lab (ECL) is a biotechnology infrastructure company that enables scientists to conduct real wet-lab experiments entirely remotely through a cloud-based interface. Founded as a spin-out o

Encore is a Stockholm-based developer tools company that provides an open-source backend development framework that generates infrastructure configuration, API boilerplate, and deployment automation f

Endor Labs is a software supply chain security platform that addresses one of the core pain points of dependency management: alert fatigue from SCA tools that flag thousands of vulnerabilities regardl

env0 is a self-service cloud infrastructure automation platform built for platform engineering teams that manage Terraform, OpenTofu, Terragrunt, and Pulumi codebases at scale. The platform provides a

Eppo is a statistical experimentation platform designed for data-driven product and engineering teams that want to run rigorous A/B tests without moving data out of their cloud data warehouse. Founded

Equals is a modern spreadsheet application designed for SaaS founders, operators, and finance teams who need to analyze product and business metrics without relying on a data analyst or building dashb

Estuary Flow is a real-time data integration and streaming ETL company founded in 2019 and headquartered in Columbus, Ohio. The company was founded by Dave Yaffe and Johnny Graettinger to build a stre

Evidence.dev is an open-source business intelligence framework founded in 2021 that takes a fundamentally different approach to reporting: instead of drag-and-drop dashboards, Evidence lets data teams

Excalidraw is an open-source virtual whiteboard application for creating hand-drawn-aesthetic diagrams, flowcharts, wireframes, and collaborative sketches — built by Excalidraw s.r.o. in Brno, Czech R

Fauna, Inc. is a San Francisco, California-based serverless distributed database company — venture-backed private company — that developed FaunaDB (now branded Fauna), a globally distributed ACID-comp

Fingerprint is a device intelligence platform that generates highly accurate and stable visitor identifiers by combining browser fingerprinting, hardware signals, network characteristics, and behavior

Formbricks is an open-source experience management and survey platform that enables product and growth teams to collect targeted feedback from users across in-app, website, and email channels without

Ghost is a London-based independent technology company that develops and maintains Ghost, an open-source headless content management system purpose-built for independent publishers, journalists, and n

GitBook is a documentation platform founded in 2014 and headquartered in Lyon, France, that enables teams to create, manage, and publish technical documentation in a structured collaborative environme

Grafbase is a globally distributed GraphQL platform that enables developers to build, deploy, and serve data APIs at the edge without managing API servers or database infrastructure. The platform uses

Great Expectations is a data quality and validation company founded in 2018 and headquartered in San Francisco, California. The company was founded by Abe Gong and James Campbell to commercialize the

Hasura is a modern data API platform that enables developers to instantly create high-performance GraphQL and REST APIs over their existing databases without writing boilerplate backend code. The plat

Hatchet is an open-source distributed task queue and workflow orchestration platform designed for engineering teams that need reliable, observable background job execution at production scale with the

Heroic Labs is a London-based game infrastructure company best known for Nakama, its open-source distributed game server designed for building real-time multiplayer games, social features, and live-se

Highlight.io is an open-source full-stack monitoring platform that unifies session replay, error tracking, and logging into a single observability tool for web application development teams. The platf

Holistics is a business intelligence platform founded in 2016 and headquartered in Singapore, built around the idea that BI should be governed by data teams but accessible to everyone in an organizati

Honeybadger is an error monitoring and application health platform built for developer teams working in Ruby on Rails, Python, JavaScript, and other server-side environments. The platform captures app

Hugging Face is the leading AI model hosting and collaboration platform and the creator of the Transformers library — providing open-source infrastructure for sharing, discovering, and deploying machi

Icinga is an open-source infrastructure monitoring platform developed by Icinga GmbH, headquartered in Nuremberg, Germany. Originally forked from Nagios in 2009, Icinga has evolved into a fully indepe

Imply is a real-time analytics platform and the commercial company behind Apache Druid, the open-source distributed analytics database designed for sub-second OLAP queries on event-driven data. Apache

Inferact commercializes vLLM, the most widely used open-source LLM inference engine, for enterprise deployments. The company provides a managed platform, premium performance optimizations, and enterpr

Inngest is a durable execution platform that allows developers to write reliable background functions, scheduled jobs, and event-driven workflows directly in their application code without managing qu

Jenkins is an open-source continuous integration and continuous delivery (CI/CD) automation server that has become the foundational infrastructure for software build and deployment pipelines worldwide

Jina AI is a Berlin-based AI infrastructure company that builds and serves state-of-the-art multimodal embedding models, reranking models, and neural search infrastructure used by developers and enter

k6 is an open-source performance and load testing tool developed and maintained by Grafana Labs that allows engineering teams to write test scripts in JavaScript, execute them from the command line or

Kaltura is an enterprise video technology company providing a comprehensive platform for video hosting, management, live broadcasting, and interactive video experiences across education, media, and co

KNIME (Konstanz Information Miner) is an open-source data analytics, reporting, and integration platform founded in 2004 by a team at the University of Konstanz, Germany, led by Michael Berthold. The

Koyeb is a serverless cloud platform that enables developers to deploy containerized applications, APIs, and background workers globally without managing servers, Kubernetes clusters, or infrastructur

Kubecost is a Kubernetes cost monitoring and optimization platform that solves one of the most persistent challenges in cloud-native infrastructure management: understanding exactly what each workload

Kubernetes (K8s) is the dominant open-source container orchestration platform — originally developed by Google engineers (Joe Beda, Brendan Burns, Craig McLuckie) in 2014, donated to the Cloud Native

Lightning AI is a New York-based AI development platform company built by the creators of PyTorch Lightning — the open-source deep learning framework used by hundreds of thousands of researchers and e

Liveblocks is a collaborative infrastructure platform that provides APIs and pre-built components for adding real-time collaboration features — presence, multiplayer editing, comments, notifications,

LlamaIndex provides the data layer for LLM applications — a set of tools for ingesting, structuring, and querying data as context for AI models. Its open-source library has become the standard for bui

Locize is a translation management platform built in Switzerland specifically for developers working with the i18next internationalization framework — the most widely used i18n library in the JavaScri

Loft Labs is a Kubernetes platform company best known for creating vcluster, an open-source project that enables fully isolated virtual Kubernetes clusters to run inside a single physical Kubernetes c

Maestro is an open-source mobile UI testing framework, backed by Y Combinator, that takes a radically simplified approach to end-to-end mobile testing by replacing code-based test scripts with a decla

Mapbox is a Washington D.C.-based location data platform that provides maps, navigation, search, and location intelligence APIs to developers and enterprises. Founded in 2010, Mapbox has built the mos

Materialize is an operational data warehouse built on Timely Dataflow and Differential Dataflow, distributed stream processing frameworks that enable it to maintain incrementally updated SQL views ove

Mattermost is an open-source, self-hostable team messaging and collaboration platform built for security-conscious enterprises, government agencies, and development teams that cannot or will not use c

Meilisearch is a Paris-based search technology company that provides an open-source, self-hostable search API enabling developers to add fast, relevant, and typo-tolerant search functionality to their

Metabase is an open-source business intelligence and analytics platform that enables anyone in an organization — not just data analysts — to query databases, create charts, and build dashboards throug

MindsDB is an open-source AI integration platform founded in 2017 by Jorge Torres and Adam Carrigan, headquartered in San Francisco, California. The company's core innovation is enabling developers an

MinIO is a Redwood City, California-based enterprise object storage company that built the most widely adopted S3-compatible open-source object storage system in the world. Founded in 2014, MinIO's op

Mirantis is a cloud infrastructure software company specializing in enterprise Kubernetes platforms and container management solutions. The company enables organizations to design, build, and operate

Mistral AI is a French artificial intelligence company building and commercializing high-performance open and proprietary large language models, positioning itself as Europe's leading AI foundation mo

Modular is an AI infrastructure company founded in 2022 by Chris Lattner — the creator of Swift and a principal architect of LLVM and Clang — and Tim Davis, headquartered in Santa Clara, California. T

Moodle is the world's most widely-used open-source learning management system — providing educational institutions, corporations, and government organizations with a free, customizable platform for on

Moov is a fintech infrastructure company that provides open-source, extensible payment and banking infrastructure for developers and businesses. Founded and headquartered in the United States, Moov''s

Moov Financial is a Cedar Falls, Iowa-based payments infrastructure company that provides open-source and API-based tools for developers building payment capabilities including ACH transfers, card acc

MotherDuck is a serverless cloud analytics platform built on DuckDB, the in-process analytical SQL database that has rapidly become a favorite tool among data practitioners for its speed, ease of use,

NocoDB is an open-source no-code platform founded in 2021 that transforms any relational database — MySQL, PostgreSQL, MariaDB, SQLite, or SQL Server — into an Airtable-like spreadsheet interface, ena

Nomic AI develops open-source embedding models and data visualization tools for AI/ML practitioners. Its nomic-embed-text and nomic-embed-vision models consistently rank at the top of the MTEB (Massiv

Northflank is a developer platform that provides engineering teams with a self-service environment for deploying containerized applications, running databases, scheduling jobs, and managing CI/CD pipe

Novu is an open-source notification infrastructure platform that provides developers with a unified API for sending and managing notifications across email, SMS, push, in-app, chat, and webhook channe

Nx is a developer tooling company and open-source project originally created at Nrwl in 2018 that provides a smart build system and workspace management tools for monorepo development. The platform an

Observable is a data visualization and collaborative analytics company founded by Mike Bostock — the creator of D3.js — and headquartered in San Francisco. Its platform enables data scientists, develo

Odoo is a Belgian software company founded in 2005 by Fabien Pinckaers and headquartered in Grand-Rosière, Belgium. The company develops and markets an open-source suite of business applications that

Oligo Security is an application security observability platform that uses eBPF-based runtime monitoring to detect when open-source library vulnerabilities are actually being exploited, rather than si

Open Loyalty is an open-source, headless loyalty platform headquartered in Wrocław, Poland. Founded in 2014, the company offers its core loyalty engine as open-source software under a permissive licen

OpenMetadata is an open-source metadata management platform that provides data catalog, data discovery, data lineage, data quality, and data governance capabilities through a single unified metadata s

Opentrons Labworks is a New York-based life sciences company that designs and manufactures affordable, open-source liquid-handling robots for research laboratories. Founded in 2014, Opentrons'' missio

Oxide Computer builds the first commercially available cloud computer — a rack-scale system that integrates hardware, firmware, and software into a single appliance enabling enterprises to run private

Permit.io is an authorization platform founded in 2021 that provides developers with a complete solution for implementing fine-grained access control in their applications. The platform offers a cloud

Phylum is an automated software supply chain defense platform that analyzes open-source packages for malicious code, vulnerabilities, license risks, and typosquatting attacks before they enter develop

Pirsch is a privacy-first web analytics platform that tracks website visitor behavior without cookies, fingerprinting, or the collection of personal data. The platform uses a cookieless tracking metho

Plane is an open-source project management platform designed as a self-hostable alternative to Jira and Linear for software development teams. The platform provides issue tracking, sprint planning, ro

Plausible Analytics is a lightweight, open-source web analytics platform built as a privacy-respecting alternative to Google Analytics. The platform collects only the data necessary to understand aggr

Plural is an open-source application deployment platform that makes it easy for engineering teams to deploy, manage, and maintain production-grade open-source infrastructure tools — Airflow, Grafana,

PoEditor is a collaborative localization management platform developed in Cluj-Napoca, Romania that provides software development teams with a straightforward, affordable environment for managing the

Pontoon is an open-source web-based localization platform developed and maintained by Mozilla that powers the translation of Firefox, Firefox for Android, the Mozilla Developer Network (MDN), and othe

Posit PBC is an open-source data science software company founded in 2009 by J.J. Allaire and headquartered in Boston, Massachusetts. Originally known as RStudio — creators of the industry-standard ID

Prebid is an open-source header bidding framework and industry consortium that enables digital publishers to run fair, transparent programmatic advertising auctions — allowing publishers to solicit bi

Prefect is a San Francisco-based Python workflow orchestration platform — backed with $46.1 million in total funding from Atreides Management, Bessemer Venture Partners, Positive Sum, and Calm Venture

Preset is a managed cloud data exploration and visualization platform founded in 2019 by Maxime Beauchemin, the original creator of Apache Superset and Apache Airflow. Preset takes the powerful open-s

Prometheus is an open-source systems monitoring and alerting toolkit — originally developed at SoundCloud in 2012 and donated to the Cloud Native Computing Foundation (CNCF) in 2016, where it became t

Quandela is a French quantum computing company founded in 2017 as a spinout from the Centre for Nanoscience and Nanotechnology (C2N) at Paris-Saclay University, headquartered in Massy, France (near Pa

Rasa is an enterprise-focused open-source and commercial platform for building, deploying, and managing conversational AI agents. Founded in 2016 and based in San Francisco, Rasa enables developers an

Redis is an open-source, in-memory data structure store used as a database, cache, message broker, and streaming engine, and the company Redis Ltd. provides enterprise-grade Redis products and cloud h

Redocly is an API documentation and governance company founded in 2017 by the creators of the open-source ReDoc library, which became one of the most widely adopted open-source renderers for OpenAPI s

Redpanda is a data streaming company founded in 2020 that has raised over $200M to build an Apache Kafka-compatible streaming platform implemented in C++ that eliminates the performance and operationa

Robusta is an open-source Kubernetes observability platform that extends Prometheus and Alertmanager with automated playbooks that enrich alert notifications with contextual diagnostic data and trigge

Rows is a collaborative spreadsheet platform that combines the familiar grid interface with native integrations to over 50 business tools and APIs, enabling teams to build live data reports and automa

Rowy is an open-source low-code backend platform that brings a spreadsheet-like table interface to Firestore databases, allowing developers and technical team members to build backend automations, int

RudderStack is a San Francisco-based warehouse-native customer data platform (CDP) enabling companies to collect, transform, and route real-time customer event data while maintaining full data ownersh

Runme is an open-source platform that transforms standard Markdown README files and runbooks into interactive, executable notebooks that run directly in VS Code or the terminal. Engineers write docume

Scalar is an open-source API tooling company founded in 2023 that has rapidly gained traction in the developer community by delivering a visually polished and highly customizable alternative to the ag

Semgrep is an application security company founded in 2020 that has raised over $100M and built one of the most widely adopted open-source static analysis tools in the developer security ecosystem. Th

Skyvern is an open-source, AI-powered browser automation framework that uses computer-vision and LLMs to navigate and interact with web interfaces — replacing brittle Selenium / Playwright scripts wit

Socket is an open-source supply chain security platform that analyzes npm, PyPI, and other package registry submissions in real time to detect malicious code, dependency confusion attacks, typosquatti

Solo.io is a cloud-native infrastructure software company that builds enterprise-grade API gateway, service mesh, and AI gateway products for platform engineering and DevOps teams. Founded in 2017 by

Spacelift is an infrastructure orchestration platform that provides a collaborative, policy-driven workflow layer on top of infrastructure-as-code tools including Terraform, OpenTofu, Pulumi, CloudFor

Stakater is a Kubernetes platform engineering company that combines professional services for building and operating production Kubernetes platforms with a portfolio of open-source tools that have gai

Starburst is an enterprise data analytics platform built on Trino, the open-source distributed SQL query engine originally developed at Facebook. The platform enables organizations to run SQL queries

StarTree is a real-time analytics database company built on Apache Pinot — the open-source distributed OLAP datastore originally developed at LinkedIn and used at scale by companies including Uber, Li

Stoplight is an API design and documentation platform founded in 2015 and headquartered in Austin, Texas, that pioneered the design-first API development workflow in which teams define their OpenAPI s

Storyboarder is an open-source storyboarding software application developed by Wonder Unit that helps filmmakers, animators, and video creators quickly visualize their stories through sketched boards,

Swimm is a code documentation platform founded in 2019 in Tel Aviv, Israel, that solves the chronic problem of documentation becoming out of date as codebases evolve. Traditional documentation lives i

Sysdig is a cloud and container security company founded in 2013 and headquartered in San Francisco, California. The company was created by Loris Degioanni, co-creator of Wireshark, and built around d

Tabular was a data infrastructure company founded in 2021 by Ryan Blue, Daniel Weeks, and Jason Reid — the same engineers at Netflix who created the Apache Iceberg open table format — and was headquar

Telegram is a cloud-based messaging and social platform founded in 2013 by Pavel Durov and his brother Nikolai Durov, originally headquartered in Dubai, UAE. The platform offers text, voice, and video

Terraform is an open-source infrastructure-as-code tool originally created by HashiCorp, founded in 2012 in San Francisco by Mitchell Hashimoto and Armon Dadgar. Terraform introduced a declarative con

Tettra is a knowledge management platform built specifically for teams that communicate primarily through Slack. Rather than requiring employees to leave their primary communication tool to search a s

The Graph is a decentralized indexing protocol that makes blockchain data queryable through standard GraphQL APIs, solving one of the most persistent engineering challenges in Web3 application develop

thirdweb is a full-stack Web3 development platform that provides the tooling layer for teams building on-chain applications, games, and commerce experiences. Its smart contract framework includes a li

TileDB is a data infrastructure company founded in 2017 by Stavros Papadopoulos (a former Intel and MIT researcher) and headquartered in Cambridge, Massachusetts, with roots in research at Intel Labs

Tilt is a developer platform that dramatically improves the local development experience for engineers building microservices and Kubernetes-native applications. The Tilt CLI watches for code changes

Timeplus is a unified streaming and batch analytics platform that enables developers and data engineers to query event streams and historical data using standard SQL without deploying and managing sep

Tolgee is an open-source localization platform developed in Prague, Czech Republic that provides developers with an in-context translation capability that sets it apart from conventional translation m

ToolJet is an open-source low-code platform for building internal tools, admin panels, dashboards, and business applications by visually connecting to databases, REST APIs, GraphQL endpoints, cloud se

Transifex is a cloud localization platform headquartered in Palo Alto, California that provides software teams with a continuous localization workflow connecting development repositories directly to t

Travis CI is a Berlin-based continuous integration and continuous delivery (CI/CD) platform — one of the original cloud-based CI services for open-source projects (founded 2011) — providing automated

Trigger.dev is an open-source background jobs and workflow platform built specifically for TypeScript and JavaScript developers who need to run long-running, durable async tasks from serverless and ed

Turborepo is a high-performance build system for JavaScript and TypeScript monorepos, designed to solve the scaling challenges that arise when large codebases are organized as a single repository cont

Twenty is a Paris, France-based open-source CRM company — backed by Y Combinator (S23) with $5.5 million in total funding including a $5 million seed round in November 2024 led by Runa Capital with 50

Typesense is an open-source search engine built for developer simplicity and millisecond search latency, designed as an accessible alternative to Elasticsearch and a self-hostable alternative to Algol

Unleash is an open-source feature management and feature flag platform founded in 2015 in Trondheim, Norway. It enables software engineering teams to separate code deployment from feature release, all

Upbound is a cloud infrastructure company founded in 2017 by Bassam Tabbara and headquartered in Seattle, Washington. The company created and is the primary steward of Crossplane — an open-source proj

Upsun is a cloud application platform-as-a-service (PaaS) that provides automated infrastructure, Git-based workflows, and deployment pipelines for application development teams. The company operates

Uptrace is an open-source application performance monitoring and distributed tracing platform built natively on OpenTelemetry, the emerging industry standard for vendor-neutral observability instrumen

VESSL AI is a machine learning operations (MLOps) company founded in 2021 and headquartered in Seoul, South Korea, with a US presence following its Y Combinator participation. The company's platform i

Vocode is a San Francisco-based open-source voice AI company providing a developer library and platform for building real-time conversational voice applications — enabling developers to create AI voic

WalletConnect is an open-source communication protocol that enables secure connections between cryptocurrency wallets and decentralized applications without requiring a browser extension or direct wal

Windmill is an open-source developer platform founded in 2022 that enables engineering teams to turn scripts written in Python, TypeScript, Go, Bash, or SQL into fully operational internal tools, sche

WSO2 is an enterprise software company providing an open-source platform for API management, integration middleware, and identity and access management (IAM). Founded in 2005 by Sanjiva Weerawarana an

Xanadu is a Toronto-based quantum computing company founded in 2016 by Christian Weedbrook, focused on photonic quantum computing — a hardware approach that uses particles of light (photons) rather th

YugabyteDB is a cloud-native distributed SQL database designed for mission-critical applications that require high availability, linear scalability, and strong consistency across geo-distributed deplo

Zabbix is an open-source enterprise IT monitoring platform developed and maintained by Zabbix LLC, headquartered in Riga, Latvia. Founded in 2001, Zabbix has grown to become one of the world's most wi

Zammad is a Berlin-based open-source helpdesk and ticketing platform developed by Zammad Foundation GmbH and founded in 2016 by the creators of the OTRS helpdesk system. The platform provides organiza

Zed is a San Francisco-based code editor company building a high-performance, multiplayer code editor in Rust that aims to be significantly faster than Electron-based editors like VS Code while offeri

ZEDEDA is an edge computing infrastructure company founded in 2016 and headquartered in San Jose, California, that provides cloud-native orchestration software for managing distributed edge computing

ZenML is a Munich-based MLOps company that develops an open-source framework for building machine learning pipelines that are portable, reproducible, and infrastructure-agnostic — enabling data scient

Zesty is a cloud cost optimization platform that uses machine learning to continuously right-size AWS compute resources and automatically manage Reserved Instance and Savings Plan commitments. The pla

Zhipu AI (Beijing Zhipu Huazhang Technology Co., Ltd.) is a Chinese artificial intelligence company founded in 2019 by Tang Jie and Ke Xu, spun out from Tsinghua University''s Natural Language Process