Scratch - Scratch is the programming language & online community where young people create stories, games, & animations.
Practice.dev - Practice programming for free
Cyberix3D - Free online 3D Game Maker. Make your own 3D games online!
PrepBootstrap - Bootstrap themes, templates & widgets with code examples
Castle Game Engine - An open-source 3D/2D game engine for ObjectPascal.
Programming Hero - Personalized, fun, and interactive way to learn programming