Hi Andy,
(Please use guix-devel@gnu.org for discussions–bug-guix@gnu.org is linked
to a bug tracker.)
I’m aware of OSTree. It seems to share some of the goals of Nix & Guix,
but not all (for instance, the blog entry linked above reads “OSTree […]
only handles filesystem trees; it’s not a package system.”)
Is there any particular aspect you wanted to discuss?
Thanks,
Ludo’.