Scratch - Scratch is the programming language & online community where young people create stories, games, & animations.

CodeKeep - Codekeep lets you store and share bits of code and text with other users. Snippets can be organized into folders/labels for instant reuse.

codeSpark - Teach young kids basic computer science with video games

thiscodeWorks - Save and share code that works

Tynker - Game Worlds for Kids to Learn Programming

Refactor.io - Share your code instantly for refactoring and code review