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System Monitors
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Coconut Battery

Keep track of all the details of what’s happening with the battery in your portable mac as it happens.

eul

Stats for CPU, memory, network, battery, Bluetooth, disk and GPU in a nice dark-mode compatible interface.

Stats

Check your Mac’s stats at a glance in the menu bar. Stats covers disk, network, CPU and RAM. You can also see what’s going on with GPU, sensors and fans.

XRG

It’s getting a little long in the tooth, but still works and does a whole lot of monitoring: CPU, GPU, memory, battery status, temperature, network and disk — plus current weather and stock market data.