These menu bar apps allow you to keep track of your system statistics in real time.

This menu bar app tells you the temperature of each of the CPU cores on your Mac, and also lists the fan speeds cooling off these cores.
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TrashMe 3 helps you clean your Mac to recover space. But it also has a standalone menu bar app to monitor your system activity, like CPU load & temperature, memory usage, battery status, graphic card in use, and network configuration.
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Hot is a menu bar app that displays in real time CPU throttling due to thermal issues.
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Better Menu Bar shows your computer stats in your menu bar. It gives you information about your CPU, RAM, Battery, and Network in a consolidated window. It also has an automatic RAM cleanup feature that comes in handy when your computer falls below a certain level of free RAM.
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iStatistica is a system monitor for macOS that keeps an eye on your CPU, memory, disk usage and network activity.
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