grap: grap
grap:
grap: Grap is a language for typesetting graphs specified and first
grap: implemented by Brian Kernighan and Jon Bentley at Bell Labs. It is
grap: an expressive language for describing graphs and incorporating them 
grap: in typeset documents. It is implemented as a preprocessor to
grap: Kernigan's pic language for describing images, so any system that
grap: can use pic can use grap. For sure, TeX and groff can use it.
grap:
grap: This version of grap was written by Ted Faber, and is available from:
grap: http://www.lunabase.org/~faber/Vault/software/grap/