The programmer's solid 3D CAD modeller
Blockbench - A low poly 3D model editor
A free and open source multiplatform 3D parametric modeler
A python parametric CAD scripting framework based on OCCT
STL Viewer for java
3D modeler, 3D game maker, 3D demo maker
LDraw™ editor for LEGO® style digital building instructions.
A 3D scene editor for Ogre in Purebasic
Convert heightmaps to stl
Cuts 3D objects from polystyrene foam (EPS/XPS)
1st 3D game engine built in C# for .NET, Visual3D Engine's predecessor