http://www.emediez.com/beholder/filext.html

He's listed all the formats his collection of 3D programs can handle.

Also, there is a link to Crossroads download, which I thought was lost...

http://sites.onlinenw.com/rickhowd/

Thanks, some useful information here   

Sadly, those links are either 404 or stumps with onward links dead.
 

That's like it is today... you'll either be f***book. or you'll die...
sometimes you can be lucky with the Wayback Machine though ...