RetroArch - RetroArch is a frontend for emulators, game engines and media players.
calibre - Ebook manager, viewer & converter
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.
FBReader - FBReader is an e-book reader for various platforms. Features:
Playnite - Source code generated using layoutit.com
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.