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The https://freeCodeCamp.com open source codebase and curriculum. Learn to code and help nonprofits.
:books: Freely available programming books
A kickstarter guide to writing ES6.
The Live Coding Music Synth for Everyone
AnkiDroid: Anki on Android
Neat user/repo/issue hovercards for GitHub.
Instructor lesson plans that accompany Xcode projects, for guiding in-class experiential learning.
CTFs as you need them
GitHub Classroom automates repository creation and access control, making it easy for teachers to distribute starter code and collect assignments on GitHub.