a game to learn (or teach) how to use standard commands in a Unix shell - phyver/GameShell

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Master the command line with Effective Shell - a free online book for developers and power users

Writing a sqlite clone from scratch in C

A collection of principles and patterns that shape software systems, teams, and decisions.

A project-based course on designing the environments, state, verification, and control systems that make Codex and Claude Code reliable.

Regex visualizer & editor, make the regular expression easier.

Build native desktop applications with TypeScript and Native markup. Native SDK provides a native renderer, components, app state, and development tools.

A local whiteboard for you and your agents.

Download it today at offline.tldraw.com.

Understand the minds you design for and the mind you design with.

Run Lean 4 programs, check proofs, and follow guided tutorials.

Psysonic is a modern desktop client for self-hosted music libraries. Fast, native, and beautiful — built for Navidrome and Subsonic servers.