e.g http://www.geany.org/ Requires GTK (>= 2.16.0) libraries and their dependencies (Pango, GLib and ATK)The alternative would be to extend QED but I expect that would require morework.
Another alternative: take the sources of RSC and extend it. RSC is open source: http://www.seasip.info/Gem/gengem.html http://www.mbernstein.de/download/pc/rcs.lzh Greets, Ole