Prime95 - Prime95 is a program that searches for new Mersenne prime numbers.
power-profiles-daemon - Makes power profiles handling available over D-Bus
HeavyLoad - The individual test methods employed by HeavyLoad can be customized to fit your needs.
Zzz - Zzz is a custom power management utility for Windows that is designed to eclipse built-in power management systems.
CPU Frequency Selector - Cinnamon CPU Frequency Selector Applet
PowerTOP - PowerTOP is a Linux tool to diagnose issues with power consumption and power management.