Box Island: One Hour Coding - Charming mobile coding game (Hour of Code version)

ATutor - Free, open source LMS with integrated social networking

CheckIO - CheckIO is a web site with a mission: To teach JavaScript and Python coding skills through a game-playing interface. It is designed to teach new skills or improve existing skills through completing challenges.

Sublime Tutor - Learn Sublime Text from a tutor who sits inside the editor

aux.app - A free web-based music platform to play music from other popular online streaming services.

SQLBolt - SQLBolt provides a set of interactive lessons and exercises to help you learn SQL