Vnstat Monitor
Vnstat monitor is a simple Gnome shell extension which show daily network bandwidth usage. Bandwitdh usage data is taken from the daemon vnstat.
Requirement
Installation
Copy the folder vnstat-mon@putrasattvika.github.io to ~/.local/share/gnome-shell/extensions.
You might need to restart the Gnome shell for the extension to appear. To do that, press alt+F2, type r, and press Enter.