Open Source Developer Tools Apps

Open-source, cross-platform 2D/3D game engine with Vulkan, Metal, and WebGL support for web, mobile, and instant gaming platforms

A modern Redis and Memcached replacement engineered for multi-core servers — delivering 25x more throughput, better cache hit rates, and up to 80% lower memory consumption with full API compatibility.

Self-hosted, enterprise-grade feature flag platform for safe, targeted, and data-driven feature releases.

Fern turns a single OpenAPI, AsyncAPI, or Protobuf definition into type-safe SDKs for nine languages and a hosted API documentation site, all from one CLI and one source of truth.

Open-source feature flagging, remote config, and A/B/multivariate testing platform for web, mobile, and server-side apps — self-host or use the hosted SaaS.

Git-native feature flag platform that stores, versions, and deploys feature toggles directly in your own Git repositories with no external database required.

A lightweight, self-hosted push notification server that sends and receives messages in real time over WebSocket, with a sleek web UI and a native Go plugin system.

A unified open source DevOps platform combining Git hosting, CI/CD pipelines, cloud development environments, and artifact registries in a single self-hosted system.

Open-source GraphQL schema registry and observability platform with breaking change detection, federation support, and CI/CD integration for teams of any size.

A reactive Python notebook that eliminates hidden state, runs reproducibly, and deploys as a web app or script — stored as pure Python, built for the AI era.

Send push notifications to your phone or desktop from any script or service using a single HTTP PUT or POST—no sign-up required.

Open source payments infrastructure that turns software into a business — subscriptions, usage-based billing, digital products, and merchant-of-record compliance in one platform.

Beautiful, interactive OpenAPI documentation with a built-in offline-first API client and multi-language code generation — all in one open-source platform.

The open-source Postgres development platform that replaces Firebase with authentication, real-time APIs, edge functions, storage, and vector embeddings — all built on PostgreSQL.

Build and deploy fully-managed AI agents and background jobs in TypeScript — with no timeouts, durable retries, real-time observability, and elastic scaling built in.