Schau dir einmal 123D Design an.
http://www.123dapp.com/design
Imports 123D Design:
Solids (as SAT, STEP, SMB, 123DX, DWG, DXF)
Meshes (as STL, OBJ)
Sketches (as SVG)
Exports 123D Design:
Export 3D solid formats: DWG, DXF, 123DX, SAT, STEP (from Export Selection only)
Export 3D mesh...