cctop

You want a quick glance at how high the CPU spiked, how much memory is left, whether the network is busy — without keeping Activity Monitor open. cctop tucks that into the menu bar: live CPU, memory, and network status scroll right in the top bar.

Features

Live Monitoring: CPU, memory, and network in the menu bar.

At a Glance: Key stats always visible up top.

Open & Light: Free and very light on resources.