Mupen64Plus - N64 emulator and plugins for Linux, Mac OSX, FreeBSD, and Windows
RetroArch - RetroArch is a frontend for emulators, game engines and media players.
Project64 - Project64 is a Nintendo 64 emulator for the Windows platform.
Snes9x - Snes9x is a portable, Super Nintendo Entertainment System (SNES) emulator.
Sixtyforce - Sixtyforce is an emulator that runs Nintendo 64 games.
BSNES - bsnes is a Super Nintendo (SNES) emulator focused on performance, features, and ease of use.