RetroArch - RetroArch is a frontend for emulators, game engines and media players.
RomWorldOnline - RomWorldOnline is a site committed to SNES ROMS and ROMS for different operating systems and gaming devices.
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.
The Iso Zone - To improve gameplay
Playnite - Source code generated using layoutit.com
NDSEmulator - NDSEmulator is a site completely committed to certain things, and that is Nintendo DS and NDS emulators.