RetroArch - RetroArch is a frontend for emulators, game engines and media players.
LaunchBox - LaunchBox is a portable, box-art-based games database and launcher for DOSBox, emulators, arcade cabinets, and PC Games. Download it free!
Mesen - Mesen is a NES/Famicom emulator and NSF player.
HyperSpin - HyperSpin is an animated arcade frontend for Windows for use on Home Arcade Machines.
Snes9x - Snes9x is a portable, Super Nintendo Entertainment System (SNES) emulator.
OfflineList - A widely-used, multi-platform ROM manager.