What are some alternatives?
When comparing batocera.linux and Recalbox, you can also consider the following products
LaunchBox - LaunchBox is a portable, box-art-based games database and launcher for DOSBox, emulators, arcade cabinets, and PC Games. Download it free!
Lakka - Lakka is the official Linux distribution of RetroArch and the libretro ecosystem.
HyperSpin - HyperSpin is an animated arcade frontend for Windows for use on Home Arcade Machines.
Retropie - RetroPie allows you to turn your Raspberry Pi or PC into a retro-gaming machine.
RetroArch - RetroArch is a frontend for emulators, game engines and media players.
Playnite - Source code generated using layoutit.com