Efficient glTF 3D import / export package for Unity
Editor for Obj files
An STL model viewer, editor, and creator for manipulating STL files.
Software to restore cyclorama (360 deg. panorama) from photos
A free editor for openSCAD based on .NET Scintilla
Easy Terrain editing and Heightmap creation
1st 3D game engine built in C# for .NET, Visual3D Engine's predecessor