18Blender 2.45/ Blender 2.46 RC4 for Windows

Save all scene data in a single .blend file .blend format supports compression, digital signatures, encryption, forwards/backwards compatibility and can be used as a library to link to from other .blend files Read / Write TGA, JPG, PNG, Iris, SGI Movie, IFF, AVI and Quicktime GIF, TIFF, PSD, MOV (Windows and Mac OS X) Native import and export for DXF, Inventor and VRML files, with python scripts available for many other 3D formats Create stand-alone executables containing interactive 3D content or play back with the 3d web browser plugin
Homepage - http://www.blender.org/