The FSF has just put up a post about launching fundraising support for GNU Guix:

The Free Software Foundation (FSF) today announced that we would begin accepting donations as part of our support for GNU Guix, a dependable and customizable package manager, along with GuixSD, GNU's advanced free GNU/Linux distribution. Donations will primarily go to increasing the project's build farm capacity so it can manage the growing number of packages and users.

Lots more on the linked blog post, including some of the properties that make Guix and GuixSD special.

But hey, most importantly, donate today! A beautiful future for free software thanks you!