gnome shell extension

https://extensions.gnome.org/extension/675/lunar-calendar/

Tweak Tool to Customize GNOME Shell, Change the Behavior and Disable UI Elements

Toggle the Looking Glass visibility by clicking on a panel icon.

https://extensions.gnome.org/extension/6325/control-monitor-brightness-and-volume-with-ddcutil/

https://extensions.gnome.org/extension/946/panel-world-clock-lite/