GtkStressTesting - GtkStressTesting or GST is a system utility designed to test and monitor various hardware components.

SpeedFan - Hardware monitor for Windows that can access digital temperature sensors located on several 2-wire SMBus Serial Bus. Can access voltages and fan speeds and control fan speeds. Includes technical articles and docs.

Mactracker - Mactracker provides detailed information on every Apple Macintosh computer ever made, including...

Open Hardware Monitor - Monitors temperature sensors, fan speeds, voltages, load and clock speeds, with optional graph.

EtreCheck - EtreCheck is a simple little app to display the important details of your system configuration and...

Argus Monitor - Argus Monitor is for monitoring and analyzing the temperature and the health status of the hardware parts of the system.