NixOS / Nix
nixos.orgReproducible, declarative, and reliable package management and system configuration
Dev Toolspackage-managernixnixosdeclarativereproducible-buildslinuxopen-source

About
Nix is an open-source package manager and system configuration tool that builds packages in complete isolation to ensure reproducibility across machines. NixOS is a Linux distribution built on top of Nix, offering declarative system configuration. With over 120,000 packages available in Nixpkgs, it allows users to share development environments and roll back system changes reliably.
Problem
Software environments are hard to reproduce consistently across machines, and package upgrades can break existing dependencies.
For
developers and system administrators who need reproducible and reliable build environments
How it works
Nix builds each package in isolation using a declarative expression language, storing all packages in a content-addressed Nix store so they never interfere with each other.
Business model
open-source
Status
launched