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freeCodeCamp.org's open-source codebase and curriculum. Learn math, programming, and computer science for free.

A collective list of free APIs

:books: Freely available programming books

Your own personal AI assistant. Any OS. Any Platform. The lobster way. 🦞

Interactive roadmaps, guides and other educational content to help developers grow in their careers.

Learn how to design large-scale systems. Prep for the system design interview. Includes Anki flashcards.

An opinionated list of Python frameworks, libraries, tools, and resources

A list of Free Software network services and web applications which can be hosted on your own servers

Telegram bot that catches Polymarket whale trades in real time and lets you copy them in one tap — plus a free public alerts channel.

Stream a game from your Linux PC to a Steam Deck or any Moonlight client, in an isolated Steam Big Picture session that leaves the desktop free.

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Plan-first Rust continuum for certified geometry, physics simulation, optimization, and rendering.

Evidence-based learning engine for Claude Code — first-principles curricula, free-recall verification with receipts, FSRS-scheduled memory, and explorable artifacts. Learn anything; keep it.

A searchable directory of 2,700+ self-hosted, open-source apps — with setup guides, alternatives & live version tracking.

Cloud-native, open-source retail banking platform reference implementation (Kotlin/Quarkus, Next.js, event-driven microservices).

Open-source auth gateway connecting 1000+ SaaS providers to AI agents through SDK, CLI, MCP, HTTP, and OpenAPI.