I.K.E.M.E.N Go is a remake of the I.K.E.M.E.N in Google’s Programming Language “Go”. It is an open source fighting game and game engine that supports M.U.G.E.N resources.
This engine pushes the boundaries of MUGEN further than imagined to be possible, and it's better in many aspects. 1.1b is still my preferred version but you can't go wrong with IKEMEN Go.