Low-footprint RDF triple store library with SPARQL 1.1 interface
Remote desktop server which allows you to connect to your machine remotely
HTTP Library for GLib - https://libsoup.gnome.org/
Papers is a document viewer for PDF and other document formats aimed at the GNOME desktop
A backend implementation for xdg-desktop-portal for the GNOME desktop environment
μPlayer: A small video player targeting mobile devices
A settings app for mobile specific things that don't fit into GNOME Settings (yet)
A wlroots based Wayland compositor mostly used on mobile phones. Often used as part of Phosh but works perfectly well on its own.
libgnome-desktop is an unstable backend library for sharing code between GNOME desktop components.