Open Source
http://www.taodyne.com/presentation/index.html
As it accepts these formats, you can use your Moi's Objects! ;)

OBJ (*.obj)
3DS (*.3ds)
Collada V1.4 (*.dae)
3DXML ASCII V3 and V4 (*.3dxml)
STL (ASCII and binary) (*.stl)
OFF and COFF (*.off)

Documentation is fabulous!
http://www.taodyne.com/presentation/tutorial-2.0.html#/