The open-asset-importer-library repository
Viewer and exporter for Unreal Engine 1-4 assets
3D Procedural Modelling and Procedural Texturing Tool in OpenGL/C++
Free 3D Mobile CAD
Geostatistics and geosciences modeling software
Graphical Interface for Medical Image Analysis and Simulation
Can convert from/to many 3D mesh file formats
Ogre mesh viewer