Prime95 - Prime95 is a program that searches for new Mersenne prime numbers.
Udev Discover - A helping tool for udev testers, coders, hackers and consumers.
HeavyLoad - The individual test methods employed by HeavyLoad can be customized to fit your needs.
Neofetch - Fancier version of Screenfetch that displays colors and supports more platforms.
CPU Frequency Selector - Cinnamon CPU Frequency Selector Applet
Screenfetch - Simple command-line tool that displays your distro's logo in text art form, your OS version...