Avogadro libraries provide 3D rendering, visualization, and analysis
Tools for 3D image analysis of additively manufactured parts
Open source set for Notepad++ for building worlds in X3D and VRML
An STL model viewer, editor, and creator for manipulating STL files.
MatLab App for calculating fitting isotopic exchange profile data
Cuts 3D objects from polystyrene foam (EPS/XPS)