LeoCAD - LeoCAD is a CAD program for creating virtual LEGO models.
Online 3D Model Converter - free online 3D model converter, upload a model and export it into popular formats
LDraw - LDraw is an open standard for LEGO CAD programs that allow the user to create virtual LEGO models...
3D Object Converter - 3D Object Converter, a powerful 3d polygon model translation and interactive viewing shareware tool...
LDCad - LDCad is a multiplatform ...
noesis - Rich Whitehouse's project web site.