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.
Snes9x - Snes9x is a portable, Super Nintendo Entertainment System (SNES) emulator.
Batocera.linux - Batocera.linux is an open-source and completely free retro-gaming distribution that can be copied to a USB stick or an SD card with the aim of turning any computer/nano computer into a gaming console during a game or permanently.
BSNES - bsnes is a Super Nintendo (SNES) emulator focused on performance, features, and ease of use.