Lakka

Lakka takes the same single-purpose-appliance approach LibreELEC applies to Kodi and applies it to RetroArch, the popular frontend for dozens of emulator 'cores' covering game consoles from the 1970s through the early 2000s -- the device boots straight into a console-like emulation interface rather than a general desktop. It supports a wide range of small, inexpensive single-board computers (Raspberry Pi models prominently among them) as well as standard PC hardware, with per-platform performance tuning so even a low-power board can emulate many older console generations acceptably. Like LibreELEC, updates are applied as whole-image reflashes rather than individual package updates, keeping the appliance simple and consistent.