RetroArch - RetroArch is a frontend for emulators, game engines and media players.
Lutris - Lutris is an open source gaming platform for GNU/Linux.
ZSNES - ZSNES is a Super Nintendo Entertainment System emulator.
mGBA - mGBA is an open source emulator of the Game Boy Advance. The goals are speed and accuracy.
BSNES - bsnes is a Super Nintendo (SNES) emulator focused on performance, features, and ease of use.
GOG Galaxy - Truly gamer friendly, DRM-free online gaming platform.