Trekmeshes.eu

Here is a free 3d model converter
http://web.t-online.hu/karpo/

It imports and export a lot of formats.

Edit: It appears i was to fast and exited to post. The progam can not save in free mode, but for only 40 euro's it can. Making it the cheapest program i have found yet.

Know any more programs? Post them in this tread.

I own Deep Exploration, from Right Hemisphere, and it is a very good piece of software.
Other good software is Polytrans, from Okino graphics.

Anyway, today a lot of 3d applications can export and import in fbx format. Usually it works very well, and it´s free.

About the http://web.t-online.hu/karpo/, I have the version 4.40 unregistered, but it can save the files converted...