What is MUGEN?
M.U.G.E.N (also known as Mugen, MUGEN) is a freeware 2D fighting game engine designed by Elecbyte. Content is created by the community, and thousands of fighters, both original and from popular fiction, have been created. It is written in C and originally used the Allegro library. The latest versions of the engine now use the SDL library.

WinMUGEN title screen KFM fight in WinMUGEN

More info here.
Useful links: Elecbyte, MFG forum, MFG database
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Who is DeathScythe?
Hello, I'm DeathScythe (aka Crepa on some other medias), a brazilian MUGEN creator. I found out about MUGEN around 2008/2009 and since then started editing content for personal usage, until I found myself comfortable enough to release my creations for download.