What might be a good canditate is the MorphOS version of Papyrus, AFAIK only some minor legal problems and a runaway coder that lead to this to be mouthballed so dramatic.
Sources should be gcc-clean and the required level of MUI available to all systems (including 68k and maybe even AROS).
+1 here, although I never had a chance to try it, it seemed it was nearly finished ! was it only for MOS ?
