Unity - The multiplatform game creation tools for everyone.
Kwambio - Unique products made (3D printed) by you
Godot Engine - Feature-packed 2D and 3D open source game engine.
Zazzy - Design and sell your own 3D printed jewelry
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
ZEUS - Scan, copy, print, and fax objects for 3D printing