Hiya.
UltimateUnwrap3d has a TON of file formats it can load/save in. Check out their main page here:
http://www.unwrap3d.com/index.aspx ...and check out the list of formats here:
http://www.unwrap3d.com/formats.aspx It's NOT a modeling program, it's a UV program...but you can import/export a LOT of 3d formats (as well as 2d).