A python parametric CAD scripting framework based on OCCT
An interactive viewer for three-dimensional chemical structures.
Free cad viewer for 3d drawings in different formats
Converts between many 3D data formats
kicad 3D is aimed to add 3D realistic feature on kicad pcb CAD
Game engine supporting many 3D/2D formats and graphic effects
3D model viewer and world navigator.
The X3DV Module Suite is a free set of Netbeans modules to code in X3D