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Find startups and other companies in the COSS ecosystem
Time-travel & recovery for MySQL/Postgres
dbtrail is an open-source database change-tracking tool that records every row change in MySQL and PostgreSQL databases, making historical data searchable and reversible. It captures before-and-after images of every row via the binary log or WAL replication protocol, enabling time-travel queries and precise row-level recovery without touching the production database host.
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Self-hosted DBaaS platform for PostgreSQL
Autobase is an internal database platform for PostgreSQL that brings a managed DBaaS experience to self-hosted infrastructure. It enables teams to deploy, manage, and scale production-ready, highly available PostgreSQL clusters on their own servers, virtual machines, or cloud environments. The platform automates failover, backups, point-in-time recovery, zero-downtime upgrades, and cluster scaling through a web-based console and Ansible automation. Autobase has been actively developed since 2019 and is used in production by teams worldwide.
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Declarative AI data infrastructure platform
Pixeltable is a declarative data infrastructure platform for multimodal AI applications that unifies storage, transformation, indexing, and orchestration of video, images, audio, and text under a single table interface. It uses computed columns to represent model inference and data transformations, enabling incremental updates, automatic data lineage tracking, and reproducible AI workflows without custom orchestration code.
Maker of Firefox open-source web browser
Mozilla Corporation is a wholly owned subsidiary of the Mozilla Foundation that develops and distributes Firefox, one of the world's most widely used open-source web browsers. The company also produces a suite of privacy-focused products including Mozilla VPN, Firefox Relay, and Mozilla Monitor, with the stated aim of promoting user choice and agency on the internet.
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Check out COSS Weekly on the webAI company developing large language models.
DeepSeek is an AI company focused on developing and applying advanced artificial intelligence technologies. Their core product is built on large language models and aims to serve enterprise clients. They specialize in tools and solutions for various industries.
AI research lab building customizable LLMs
Thinking Machines Lab is an AI research and product company building customizable, multimodal AI systems designed for human-AI collaboration. The company develops open-weights foundation models, a fine-tuning API called Tinker, and interaction model research aimed at making AI more adaptable to individual needs.
Native C++ SQL client for all major databases
DearSQL is a native desktop SQL client for SQLite, PostgreSQL, MySQL, MariaDB, MongoDB, Redis, Oracle, MSSQL, and Redshift, built with C++ and ImGui. It runs natively on macOS, Linux, and Windows with no Electron or JVM dependency, offering a fast, lightweight interface with features including syntax highlighting, inline table editing, SSH tunneling, TLS/SSL support, and an optional AI assistant.
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Open-source game engine and MMO developer
Fenris Creations (formerly CCP Games) is an Icelandic video game developer best known for EVE Online, a massively multiplayer online game with a single-shard universe, player-driven economy, and emergent gameplay. The company has open-sourced its Carbon game engine framework, which powers EVE Online and EVE Frontier, releasing it under the MIT license. Founded in 1997 in Reykjavík, Fenris Creations became independent in May 2026 following a management buyout from Pearl Abyss and entered a research partnership with Google DeepMind.
Research & product lab for AI agents
Cosmic Stack is a research and product lab building agents, infrastructure, and tools for the next decade of software. The company operates across four surfaces: Labs (experimental prototypes), Open Source (hardened tools including Mercury Agent), Incubator (founder-led companies built on the agent stack), and Cloud (managed runtime for agents). Its flagship product, Mercury Agent, is a terminal-native AI coding agent with 40+ tools, persistent memory, and a provider-agnostic runtime, licensed under MIT.
Real-time search analytics database
SereneDB is a real-time search analytics database that unifies Elasticsearch-like search and ClickHouse-like analytics in a single, Postgres-compatible database. Search is a first-class citizen of the query engine, powered by IResearch, an open-source C++ information retrieval library. SereneDB is designed to turn lakehouses, databases, and object storage into a Postgres-compatible layer for real-time search, analytics, and AI agent workloads without requiring data movement.
Unified AI platform for open-source data science.
Anaconda provides a distribution of the Python and R programming languages for scientific computing, that aims to simplify package management and deployment. It is built on technologies such as Python and R, and primarily serves enterprise customers.
AI coding agent for VS Code
Kilo Code provides an AI coding agent for VS Code. Its technology combines features of Cline, Roo, and its own additions.
Human-centric AI research and model development
Nous Research is the creator of the Hermes agent. It develops human-centric simulators and models through its cutting edge research in natural language processing. Its primary focus areas include large language model architecture, data synthesis, and output steering, all aimed at aligning AI systems with real-world user experiences.
Self-hostable team and group chat application.
Chatto is a fast, fully-featured, self-hostable chat application built for teams and communities who want to own their conversations. Distributed as a single binary with no external dependencies, it supports real-time messaging, voice and video calls with screen sharing, fine-grained roles and permissions, and modular server-side extensions. Chatto encrypts message text and account data with per-user keys and supports crypto-shredding on account deletion. A hosted cloud offering, Chatto Cloud, is also available for teams that prefer managed infrastructure.
Web publishing and e-commerce platforms
Automattic is a company that builds products for the web, including WordPress.com, WooCommerce, Jetpack, and more. Its core products are built on technologies like PHP, JavaScript, and MySQL, and it primarily serves both consumers and enterprises.

