Vast index of freely available programming books and courses by language.

Directory of free public APIs grouped by topic, with auth and HTTPS noted.

Catalog of software you can host yourself instead of renting as a service.

Step-by-step guides to rebuild real technologies from scratch to learn them.

Readable algorithm implementations across dozens of programming languages.

Workflow automation you can self-host to connect apps and APIs visually.

Drop-in local API compatible with common AI endpoints, no GPU required.

Self-hosted chat interface for local and remote language models.

Open-source codebase behind the free full-stack curriculum.

Linux terminal environment on Android with no root required.

Generates the status badges you see at the top of most READMEs.

A cross-platform client for chatting with local language models.

Open-source Android agent that reads your screen and performs multi-step tasks from plain-language instructions.