Nixpkgs is a collection of packages for Nix package manager.

NixOS linux distribution source code is located inside nixos/ folder.

• NixOS installation instructions
• Documentation (Nix Expression Language chapter)
• Manual (How to write packages for Nix)
• Manual (NixOS)
• Continuous package builds for unstable/master
• Continuous package builds for 14.12 release
• Tests for unstable/master
• Tests for 14.12 release

Communication:

• Mailing list
• IRC - #nixos on freenode.net

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