FCE Ultra is a NES (Nintendo Entertainment System) and Famicom (Family Computer) emulator for a variety of different platforms, based on Bero's FCE. Game compatibility is very high, provided you provide non-corrupt ROM/disk images.
It has been tested (and runs) under DOS, Linux SVGAlib, Linux X, Mac OS X, and MS Windows. A native GUI is provided for the MS Windows port, and the other ports use a command-line based interface. The SDL port should run on any modern UNIX-like operating system(such as FreeBSD) with no code changes.