I've always found FW GUI to be fresh and sophisticated. And other programs like Amiga Writer a bit unpolished or amateurish like WW. And I usually end up to use FW for word processing & printing I need...

But I don't know if there's much to gain with sources for it. It could be a big work to implement new features or support for more modern things... maybe the whole engine isn't up to it without complete rewrite? Porting current version to native MorphOS binary doesn't make much difference either... 68k version works pretty good itself. But if it could be get freeware or freewared by open sourcing with reasonable amount of money, so be it... although it sounds like it isn't going to be get with reasonable amount :/