Autdesk Kaydara 3D files (.fbx) are supported in several CAD/3D modeling programs and can be easily converted to some other 3D format, for example Collada DAE format. Such fbx to dae conversion can be for example done with the freely available FBX Converter provided by Autodesk, but you can find plenty of other chocies.
Open FBX file Open DAE fileA web-based freemium 3D computer graphics software
A Mac version of the popular modeling tool
An FBX convertor utility from Autodesk
A polygon modeler for 3DCG and game development
A free online 3D model conversion service
A 3D CAD translation software