Nixpkgs
/ˈnɪks.pækz/ · Noun · Development
Definitions
The primary package repository for the Nix package manager, containing over 100,000 package definitions written as Nix expressions that declaratively describe how to fetch, build, and install software in a reproducible, isolated manner.
In plain English: A massive collection of software recipes used by the Nix system to install programs in a perfectly repeatable way.
Example: "I pinned our CI to a specific Nixpkgs commit so builds are byte-for-byte identical on every machine."