Here are some things that would be useful additions to groff:
a driver for the HP Laserjet 2 and 3
-mv macros (for typesetting viewgraphs and slides)
a deroff that understands long names
a page-makeup postprocessor and associated macro package
a complete, self-contained manual
If you want to work on one of these, I suggest you contact me first.
projects / unix-history / blob