system-monitor by Cerin

Display system informations in gnome shell status bar, such as memory usage, cpu usage, network rates…

https://extensions.gnome.org/extension/120/system-monitor/

apt-get install gir1.2-networkmanager-1.0
apt-get install gir1.2-gtop-2.0
apt-get install gir1.2-clutter-1.0 gir1.2-clutter-gst-3.0 gir1.2-gtkclutter-1.0