education

《Hello 算法》：动画图解、一键运行的数据结构与算法教程。支持简中、繁中、English、日本語，提供 Python, Java, C++, C, C#, JS, Go, Swift, Rust, Ruby, Kotlin, TS, Dart 等代码实现

AnkiDroid: Anki flashcards on Android. Your secret trick to achieve superhuman information retention.

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.

Over 1000 flashcards to learn Rust, SQLite, Lua, C, Godot, or Wolfram Language from first principles. Written in markdown with script to convert them to Anki decks or PDF files.

Build a system, load it until it breaks, and watch why. A system design simulator for learning distributed systems.