GuestSneezeOS is described as 'Robust, free-to-use, lightweight, immutable, operating system designed to bring the functionality of Valve's SteamOS to a wide range of devices, including desktops, laptops, and more' and is an app. There are more than 10 alternatives to GuestSneezeOS for a variety of platforms, including Linux, Windows, Mac, Wine and Steam apps. The best GuestSneezeOS alternative is Arch Linux, which is both free and Open Source. Other great apps like GuestSneezeOS are Windows 10, SteamOS, Bazzite and Nobara Linux.
GuestSneezeOS is more lightweight