Project64 - Project64 is a Nintendo 64 emulator for the Windows platform.
RetroArch - RetroArch is a frontend for emulators, game engines and media players.
Mupen64Plus - N64 emulator and plugins for Linux, Mac OSX, FreeBSD, and Windows
BSNES - bsnes is a Super Nintendo (SNES) emulator focused on performance, features, and ease of use.
ZSNES - ZSNES is a Super Nintendo Entertainment System emulator.
Corn - Corn is a very fast Nintendo 64 emulator.