Hey sorry I didn't see this post earlier, we at LuminariMUD have been actively developing a MUD that started about 3.5 years ago. I'd say the first 1.5 years we were mostly influenced by games such as Neverwinter Nights (DnD 3.5). From there we took heavier influence from d20 I'd say for about a year, and for the past year we've been heavily influenced by Pathfinder. As a matter of fact, I'd say we look more Pathfinder than anything else right now.
Our level of development is -extreme- (our first year we had over 2000 SVN revisions, since then we've had an additional 3354 SVN reivisions), we didn't start with the CWG/d20 code bases but actually whatever version TBA was running 4 years ago. I then pulled out an old codebase I worked on as a youngin' that was heavily influenced by DnD3.5 rules, ripped out stuff I liked from there and plopped it in... doing things within my own vision at the beginning, as soon as more folks got involved, we started integrating ideas/code from both CWG/d20 that we felt were superior.
So needless to say we'd be heavily interested in contributing to a project of similar nature if it was developed publicly like on Github or whatnot.
I'll shoot you an e-mail Ptrayal.
Regards,
Mosheh (Zusuk) of LuminariMUD