Steel Stubs
Computers, CAD and CAM, AutoCAD, Applications - Steel Stubs. A commercial add-on for AutoCAD 2000 which helps in the development of 3D structural and mechanical models.
http://steelstubs.bizland.com/
CAD Studio
CAD Studio - Autodesk Gold Partner (d ve Xanadu+Dagis). AutoCAD, LT, Inventor, Vault, Civil 3D, 3ds max, Revit, HP workstations, DesignJet.
https://www.cadstudio.cz/