English Site:
http://nekomimi.cafe.coocan.jp/wiki/?InfinityCat
Japanese Site:
http://nekomimi.cafe.coocan.jp/wiki/?%CC%B5%B8%C2%C7%AD
This is a clone of the 2D fighting game engine M.U.G.E.N. designed by Elecbyte.
http://en.wikipedia.org/wiki/M.U.G.E.N
There are some screen shots available as well.
http://nekomimi.cafe.coocan.jp/wiki/...
Source: OS2.jp