The GNOME Core Applications are a software suite of approximately 30 software applications that are packaged as part of the standard free and open-sourceGNOME desktop environment. GNOME Core Applications have the look and feel of the GNOME desktop, and often utilize the Adwaita design language. Some applications have been written from scratch and others are ports.
A comprehensive list of these aplications is aviable at apps.gnome.org
Configuration
Settings – main interface to configure various aspects of GNOME. Diverse panels represent graphical front-ends to configure the NetworkManager daemon and other daemons.
GNOME Circle is a collection of applications which have been built to extend the GNOME platform,[5] utilize GNOME technologies, and follow the GNOME human interface guidelines.[6] They are hosted, developed, and managed in the GNOME official development infrastructure, on gitlab.gnome.org. Developers who are using the GNOME platform can apply for inclusion in GNOME Circle. Benefits include promotional support and eligibility for project contributors to become GNOME Foundation members.[5] Circle applications are not part of GNOME Core Applications.