This project last update seems to be the most presently (2014):
https://sourceforge.net/projects/mugensgf/
It seems it was made by the same person who made OpenMortal as its mentioned
here:
https://sourceforge.net/projects/sgfabric/
I find it weird that there were so many playable MUGENs, but all of them
stopped developing for some reason. And with all their work, wouldn't be
possible to use theirs to finish what they started? Hmmm. May is time for me
to learn!
Jmugen only had one vs one available but in this version it is possible to
fight against a CPU.