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
Autodesk FBX Review - FBX Review is a lightweight, standalone software tool for viewing 3D assets and baked animations...
3D Object Converter - 3D Object Converter, a powerful 3d polygon model translation and interactive viewing shareware tool...
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
noesis - Rich Whitehouse's project web site.