Backloggery - Backloggery helps gamers keep track of unplayed and unfinished games in their collection.
RetroArch - RetroArch is a frontend for emulators, game engines and media players.
HowLongToBeat - How long does it take to beat your favorite games?
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.
Infinite Backlog - A social game collection tracker
Playnite - Source code generated using layoutit.com