Cyberix3D - Free online 3D Game Maker. Make your own 3D games online!
Xmind - Xmind is a brainstorming and mind mapping application.
Godot Engine - Feature-packed 2D and 3D open source game engine.
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
Open 3D Engine - Open 3D Engine is an open-source 3D game development engine in real-time.
Coggle - Coggle is a simple, beautiful, powerful way of structuring information.