Cyberix3D - Free online 3D Game Maker. Make your own 3D games online!
Scratch - Scratch is the programming language & online community where young people create stories, games, & animations.
Godot Engine - Feature-packed 2D and 3D open source game engine.
EduBlocks - Making the Transition from Scratch to Python easier.
Open 3D Engine - Open 3D Engine is an open-source 3D game development engine in real-time.
Playir - Create your own mobile apps & 3D multiplayer games with our super-easy design tools for iOS, Android, Windows Phone and HTML5! Less programming, more playing.