RetroArch - RetroArch is a frontend for emulators, game engines and media players.
Monitornator - Server monitoring made simple
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.
OpsDash - All-in-one solution for monitoring servers, services, uptime and databases. Curated Dashboards. Rule-based alerting.
Playnite - Source code generated using layoutit.com
NIXStats - SaaS monitoring tool for window/linux servers and websites. Think up-time robot but with more features.