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.
Scratch - Scratch is the programming language & online community where young people create stories, games, & animations.
thiscodeWorks - Save and share code that works
Cyberix3D - Free online 3D Game Maker. Make your own 3D games online!
Refactor.io - Share your code instantly for refactoring and code review
Open 3D Engine - Open 3D Engine is an open-source 3D game development engine in real-time.