RetroArch - RetroArch is a frontend for emulators, game engines and media players.
TeamSnap - Sports Team, Club & League Management Software & Apps
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.
Spond - The easiest way to organize team sports or other type of group activities
Playnite - Source code generated using layoutit.com
Sportlyzer - Sportlyzer is a player development and team management software for youth and amateur sports clubs. The platform connects coaches, managers, players and parents.