Udev Discover - A helping tool for udev testers, coders, hackers and consumers.
Neofetch - Fancier version of Screenfetch that displays colors and supports more platforms.
Archey 4 - Archey 4 is a system information tool written in Python
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...
Ufetch - Tiny system info for Unix-like operating systems