NixOS
NixOS is an independently developed GNU/Linux distribution that aims to improve the state of the art in system configuration management. In NixOS, the entire operating system, including the kernel, applications, system packages and configuration files, are built by the Nix package manager.
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Bazzite
Bazzite is an immutable Linux distribution based on Fedora and designed with gaming in mind. It can run on desktop computers, the Steam Deck, and other handheld gaming devices.