Playfire - Playfire is the global community for gamers.
RetroArch - RetroArch is a frontend for emulators, game engines and media players.
Gaikai - Gaikai is a company which provides technology for the streaming of high-end video games.
Playnite - Source code generated using layoutit.com
Parsec - Streams games locally or over the internet
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.