Faceting design software
Converts between many 3D data formats
Fix STL files for 3D printing
A C++ Tool for the Fast Prototyping of Topological Data Structures
build three dimensional structure
A microscopic pedestrian crowd simulation system and library
Not your usual Architectural Modeler
Interactive spherical geometry software.
StereoWS developed by UCL-MSSL within the ProVisG project
domes, vaults and eggs - program to create 3D models and plans
Cuts 3D objects from polystyrene foam (EPS/XPS)