[Wolfighter]

Or you can use Gmax for 3d modeling and use the buggy buggy exporter.

Here you can download gmax for free:
http://www.turbosquid.com/gmax

And here is the exporter:
(The link is inoperative)

And the converter:
(The link is inoperative)

You need also the SFS extractor
viewtopic.php?t=2268

Thats are the basic free tools for start modding.