CPU Frequency Selector - Cinnamon CPU Frequency Selector Applet
Neofetch - Fancier version of Screenfetch that displays colors and supports more platforms.
Udev Discover - A helping tool for udev testers, coders, hackers and consumers.
Archey 4 - Archey 4 is a system information tool written in Python
Prime95 - Prime95 is a program that searches for new Mersenne prime numbers.
Ufetch - Tiny system info for Unix-like operating systems