Famicom stood for Family computer. For a list of mapper support and more, visit the official site. This is a good emulator, well worth the download. Grab the latest Unofficial Nester or another relative version, as those are much more current.
Japanese version is available from the official site.
Very fast emulator for older systems, grab this one for nostalgia - or if you have a 486DX etc. While this emulator hasn't been updated in quite some time, it's still one I kick around a bit. Unfortunately, the author has decided to call this project quits. The Dos and Mac versions are current, with a Win9x version expected any day now. The homepage for this Nintendo Entertainment System emulator appears to have been deleted from Fortunecity.