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NixOS

Also strong

Declarative Linux OS where `/etc/nixos/configuration.nix` (and flakes) define the entire system closure reproducibly.

linuxserverdesktopdeclarativereproducible

Operating Systems

GNU Guix System

Honorable mention

GNU/Linux distribution built on Guix functional package manager with emphasis on user freedom and bootstrapping.

linuxgnudeclarativelibre