open3mod - A free, Open-Source 3D Viewer designed to make it all easier. Massive 3D Format support
Online 3D Model Converter - free online 3D model converter, upload a model and export it into popular formats
BioBlender - BioBlender is a software package built on the open-source 3D modeling software ...
noesis - Rich Whitehouse's project web site.
pymol - PyMOL is a powerful and comprehensive molecular visualization product for rendering and animating...
3D Object Converter - 3D Object Converter, a powerful 3d polygon model translation and interactive viewing shareware tool...