Gregory's Server
If you’d like to contribute to #Guix beyond packages, don’t miss Josselin’s excellent guided tour of the source tree:
https://10years.guix.gnu.org/video/guixy-guile-the-derivation-factory-a-tour-of-the-guix-source-tree/
You’ll see there’s a surprising variety of modules, from file formats like ELF and cpio, to Linux container, initrd, and kernel module utilities. Much fun to be had!