3D file format INPUT FILE FORMAT – CAD / CAE PROGRAM
3D Studio Max (.max, .3ds) AC3D (.AC) Apple 3DMF (.3dm / .3dmf) Autocad (.dwg) Blender (.blend) Caligari Object (.cob) Collada (.dae) Dassault (.3dxml) DEC Object File Format (.off) DirectX 3D Model (.x) Drawing Interchange Format (.dxf) DXF Extensible 3D (.x3d) Form-Z (.fmz) GameExchange2-Mirai (.gof) Google Earth (.kml / .kmz) HOOPS HSF (.hsf) LightWave (.lwo / .lws) Lightwave Motion (.mot) MicroStation (.dgn) Nendo (.ndo) OBJ (.obj) Okino Transfer File Format (.bdf) OpenFlight (.flt) Openinventor (.iv) Pro Engineer (.slp) Radiosity (.radio) Raw Faces (.raw) RenderWare Object (.rwx) Revit (.rvt) Sketchup (.skp) Softimage XSI (.xsi) Stanford PLY (.ply) STEP (.stp) Stereo Litography (.stl) Strata StudioPro (.vis) TrueSpace (.cob) trueSpace (.cob, .scn) Universal (.u3d) VectorWorks (.mcd) VideoScape (.obj) Viewpoint (.vet) VRML (.wrl) Wavefront (.obj) Wings 3D (.wings) X3D Extensible 3D (.x3d) Xfig Export (.fig)
See this list for more alternatives.
http://www.paviathintegratedsolution.com/3d-process-feature