XBS
 
XBS is a simple but very useful program for plotting ball-and-sticks models
of molecules or crystals under the X Window system. By displaying successive
"frames" a kind of movie can be shown. The program can write Postscript output
files. A nice feature (in my view) is that xbs is controlled by
keystrokes and not by mousing and clicking. To run xbs, a reasonably recent
X Window release (X11R5, probably) is needed, but Motif is not required.
 
The xbs program is available as a compressed tar file here.
 
retrieved from http://ihp02.ihp-ffo.de/~msm/