The gnome metapackage eventually should contain the GNOME core apps.

https://blogs.gnome.org/mcatanzaro/2017/08/13/gnome-3-26-core-applications/

Some of these such as GNOME Logs need adaptation for GuixSD, so this
will take some time.

I do not know which apps are “core” for other desktop environments.

Regards,
Florian