Genesis IOD is a software for complex curved solid modeling and surface modeling, It is an Autocad addon.Easy Kinematics is software to simulate kinematic and motion. It is an Autocad addon.
SmartMachining is a suite of AutoCAD ARX functions designed to insert industry specific machining into AutoCAD solids for the cabinetry and furniture indusrty.
ASVIC is a developer of both AutoCAD add-ons and CAD Software. Mech-Q, AViCAD, Plate n Sheet and other CAD software are available as a free download or 30 day trial.