GNU Guix System is a free Linux distribution built on Guix, a purely functional package manager. It lets users install, upgrade and roll back software and describe the whole system in a declarative configuration, which supports reproducible setups. It is installed on the user's own hardware, and Guix can also be used as a package manager on another GNU/Linux system. The distribution is a rolling release published under the GNU General Public Licence.
Guix is a GNU Project. The Free Software Foundation, based in Boston, Massachusetts, holds the copyright on many GNU packages and is closely associated with the project. For a European organisation the software is free and can be self-hosted and audited, but the copyright and governance link runs through a US non-profit. Because no vendor cloud service is involved, the main jurisdictional question concerns that organisation rather than hosted customer data.