Atomic FE - Atomic FE is a Front-End for Multi-emulators.
RetroArch - RetroArch is a frontend for emulators, game engines and media players.
Gelide - Description and news
Playnite - Source code generated using layoutit.com
HyperSpin - HyperSpin is an animated arcade frontend for Windows for use on Home Arcade Machines.
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.