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Nix - An universal package manager
(nixos.org)
A community for everything relating to the GNU/Linux operating system (except the memes!)
Also, check out:
Original icon base courtesy of lewing@isc.tamu.edu and The GIMP
the problem nix trying to solve is reproducible build, which means from a single config file you can migrate to any machine and have the same environment, auto install and dot files. While other package manager install in a imperative way, which means you have to call the install command on every package you need and you have to remember it. That's the basic difference. You can consider trying it if you see it's worth it. It's harder than any other package manager I know, but it solves a different problem.