Open Source Developer Tools Apps

Free, MIT-licensed 2D and 3D game engine with one-click multi-platform export and no royalties.

Unite every major AI model in one self-hosted chat platform with agents, code execution, MCP tools, and enterprise authentication.

Open source AI gateway and Python SDK that gives you one OpenAI-compatible interface to call 100+ LLM providers, with built-in routing, cost tracking, guardrails, and virtual keys.

An open-source, FHIR-native healthcare platform that gives developers a compliant backend, authentication, a React component library, and serverless bots to build clinical applications in weeks instead of years.

Open-source communication infrastructure that connects your products and AI agents to every channel your users live on — Inbox, Email, SMS, Push, Chat, and more.

An all-in-one JavaScript and TypeScript toolkit — one Rust-and-JavaScriptCore binary that replaces Node.js, npm, a bundler, and a test runner with faster equivalents.

Google's internal tool, open-sourced, for transforming and moving code between repositories — keeping a confidential and public repo in sync, importing external contributions into an authoritative repo, or migrating code once.

Visual LLM workflow platform with RAG pipelines, agent capabilities, and model management for building production AI applications.

Open source feature flags, A/B testing, and warehouse-native experimentation that queries your existing data infrastructure—no data movement required.

The superpowered headless CMS for developers built with GraphQL and React

The open source operating system and SDK that lets developers build one app and run it across smart glasses from Even Realities, Vuzix, Mentra Live, and more.

Manage Nginx reverse proxies and free Let's Encrypt SSL through a beautiful web interface — no Nginx expertise required.

Run Llama, Gemma, DeepSeek, and other open LLMs on your own machine with one command and an OpenAI-compatible API.

The open-source, Next.js-native headless CMS that lives inside your /app folder and gives you a full TypeScript backend instantly.

The all-in-one open source product platform combining analytics, session replay, feature flags, error tracking, AI observability, and a built-in data warehouse in a single self-hostable stack.