NixOS / nixpkgs

A collection of over 140,000 software packages for the Nix package manager, plus the NixOS purely-functional Linux distribution.

reactos / reactos

An open-source, Alpha-stage operating system that aims for binary and driver compatibility with Windows NT-family applications.

vlang / vinix

Vinix is a bare-metal operating system for amd64 and arm64 written in the V programming language, aiming to be modern, fast, and usable.