Repository Index

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

• learn-to-code
• nonprofits
• programming
• nodejs

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

• canvas
• distributed-systems
• education
• learning

The ESP32-S3 bench guide as a React app: live pinout, lessons with interactive simulators, a code reader for the esp-labs firmware, and the bench log. In 11 languages.

• education
• electronics
• embedded
• esp32

AI 智能错题本：拍照识题、解答、知识点标签、举一反三、组卷打印与掌握度跟踪，可自托管 / AI-powered self-hosted notebook for mistakes

• ai
• education
• llm
• mistake-notebook

The universe in numbers. Free, open-source calculators for everything countable.

• astro
• bun
• calculator
• calculators

learn stuff with pen + paper + AI

• ai-tutor
• education
• local-first

☯ The simplest signal library possible

• observables
• reactivex
• education
• learning