Xmind - Xmind is a brainstorming and mind mapping application.
FreeCAD - An open-source parametric 3D modeler
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
MakerSCAD - Powerfull 3D design tool for 3D printing, virtual reality and game engine.
Coggle - Coggle is a simple, beautiful, powerful way of structuring information.
DynaMaker - Cloud service for Visual Product Configuration with parametric geometry and CAD / BIM