Fce ultra is an emulator of the original (8-bit) nintendo entertainment system (nes) released under the gnu general public license (gpl). it includes the following features (and many more):
* fully customizable color palette rendering engine
* complete sound emulation (all five channels)
* support for up to four joystick controllers
* zapper emulation for the mouse
* gamegenie emulation
* accepts compressed (pkzip, gzip) rom images
* tcp/ip network play