The performance panel is a great app to monitor your system.

Performance Panel features:
• Customisable window that always stays on top.
• Choose where the window should be shown.
• Views that display the current and historical load of the processor.
• Views that display the current memory usage.
• Multiple views that display the current usage and load of the internal and external disks.
• Views that can display various sensor information and the value history of the sensor.
• Choose from multiple color schemes.
• Create multiple panel configurations. The information, position and size can be configured for each panel configuration separately.
• Display hardware sensor data (requires additional utility that can be downloaded for free).

Some of the features are only available in the Pro version of the app.

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