[subnaught]

A descendent of pluto is still in use: http://www.cryst.chem.uu.nl/spek/platon/pl010000.html

See also: http://www.chilton-computing.org.uk/ccd/graphics/p012.htm

[gnufx]

See also http://www.ccp4.ac.uk/dist/html/npo.html, which I'm surprised to see is still there, and fittingly also has Phil Evan's name on it. Note the production of stereo plots which needed practice looking at in the right way to get the effect.

[baq]

Fascinating.