The best Game Emulator alternative to Ignition (gaming OS) is Lakka, which is both free and Open Source. If that doesn't suit you, our users have ranked five alternatives to Ignition (gaming OS) and four of them are Game Emulators so hopefully you can find a suitable replacement. Other interesting Game Emulator alternatives to Ignition (gaming OS) are Batocera.linux, Retropie and iiSU.
Lakka is the official Linux distribution of RetroArch and the libretro ecosystem. Each game system is implemented as a libretro core, while the frontend RetroArch takes care of inputs and display.
Batocera.linux is an operating system specialized in retrogaming available for your pc and different nano computers like the Raspberry and the Odroids.
RetroPie allows you to turn your Raspberry Pi or PC into a retro-gaming machine. It builds upon Raspbian, EmulationStation, RetroArch and many other projects to enable you to play your favourite classic games with the minimum set-up.
Dual-screen Android launcher designed for handhelds like AYANEO Pocket DS, Odin 2, and Retroid Dual-Screen. Currently in Alpha.
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It supports many systems plus more if you install unofficial addons made by the community plus batocera is still being maintained, unlike igntition.