Mesen - Mesen is a NES/Famicom emulator and NSF player.
Mame - MAME stands for Multiple Arcade Machine Emulator.
Nestopia - A portable and cycle-accurate NES emulator written in C++
RetroArch - RetroArch is a frontend for emulators, game engines and media players.
VirtuaNES - VirtuaNES is Famicom/NES emulator for Win32.
FB Alpha - FB Alpha or FBA as it is commonly known is an emulator of arcade games, that is, it takes the...