See http://www.lesstif.org.  It is a free Motif clone that is not quite 
finished, but will allow quite a bit of Motif based software to run.

I'm using xmcd as compiled with Lesstif.

-- 
Phil Nelson                       NetBSD: http://www.netbsd.org
e-mail: phil@cs.wwu.edu           LPF: http://www.lpf.org
http://www.cs.wwu.edu/~phil       !gifs: http://www.lpf.org/Patent/Gif/Gif.html