Spark Mail - Spark helps you take your inbox under control. Instantly see what’s important and quickly clean up the rest. Spark for Teams allows you to create, discuss, and share email with your colleagues
RetroArch - RetroArch is a frontend for emulators, game engines and media players.
Newton Mail - Newton is a fully featured mail client available for Android, iOS, macOS and Windows.
Playnite - Source code generated using layoutit.com
Aqua Mail - Android Mail Client.
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.