3D Object Converter's related

Blender	Blender
Digital Fabrication Portal	Digital Fabrication Portal
Ho TTrainz	Hungarian Trainz page
netfabb GmbH	Convert your favorite characters into STL filesl
Shareware River	Ultimate collection of quality software
The Stanford 3D Scanning Repository	The Stanford 3D Scanning Repository
Virtual Spaceflight	Orbiter

 

Other 3D related

PROTOway	Rapid prototyping
Grime	GIS, 3D & Imagery Tools
TheBest3D.com	3D & Imagery Tools