I have made some repositories you might be interested in:
Arcade Manager, a tool to easily manage your arcade (MAME/FBNeo) roms, especially for Retropie and Recalbox.
The data it uses is located in Arcade Manager data.
Retropie arcade overlays - realistic, a bunch of overlays that mimic a real arcade cabinet to use in arcade games under Retropie.
Retropie arcade overlays - artwork, a bunch of "artwork" overlays to use in arcade games under Retropie.
Console overlays, a bunch of console overlays to use in Retropie, Recalbox or Batocera.
Mame/RetroArch Bezel/Overlays tool, a tool to create, fix and convert bezels/overlays for Mame and RetroArch.
SwitchScores extension, a browser extension that improves the Nintendo Europe websites.
Retrogaming - meilleurs jeux, a bunch of "best of" games list, games history, etc.