nc-indicators

nc-indicators displays a CPU load and memory usage mini-graphs in your i3bar, much like Gnome's indicator-multiload applet. To use nc-indicators simply exec it on startup: You can turn off either indicator and change the update interval, eg.: nc-indicators uses the standard system tray icon protocol, so it can be used with any system tray-like application, not just i3bar. But it was originally created to be used with i3bar.