Nix ecosystem

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The Nix Ecosystem is a collection of technologies:

• Nix Package Manager, which uses a purely functional packaging language called the Nix Expression Language to specify reproducible build processes. Nix stores the results into hashed addresses, allowing multiple versions of the same package to live side by side.
• Nix Expression Language, a dynamic, functional and lazy JSON-like language to create expressions for reproducible derivations
• NixOS, a Linux distribution with all components built by Nix, and thus supporting reproducible and declarative system-wide configuration management as well as atomic upgrades and rollbacks.
• Nixpkgs, the largest community maintained Nix package repository
• NixOS Modules System, a library for modular expression definitions which powers NixOS configuration language.
• NixOS Testing library, a library for creating reproducible infrastructure tests, based on Nixpkgs, NixOS, QEMU and Perl.
• NixOps, a Nix based deployment and provisioning tool, which has support for AWS, Hetzner, GCE and some other cloud providers out of box
• Hydra, a Nix based continuous build system
• many other applications developed by the Nix community, utilizing and supporting these core technologies.