RetroArch - RetroArch is a frontend for emulators, game engines and media players.
UserGuiding - Create in-app experiences with the most straightforward product adoption platform — quick implementation, lasting user engagement.
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.
Usetiful - Fight user churn with great user onboarding. Interactive product tours and smart tips significantly improve your user retention.
Playnite - Source code generated using layoutit.com
Userlane - Digital adoption platform with interactive guidance for software applications allowing anyone to understand and master any software from the get-go.