NixOS is a Linux distribution based on the Nix package manager.
It is implemented and maintained in Nixpkgs.
NixOS
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Separation of concerns
Freshly minted NixOS users sometimes despair about how difficult it is to “install” software.
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Nixpkgs
the implementation of NixOS
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Home Manager
It is very popular especially among NixOS users, but it can be used on any system with Nix.
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Flakes
system-wide on NixOS or user-wide with Home Manager:
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Direnv
system-wide with NixOS or user-wide with Home Manager