CPU Frequency Selector - Cinnamon CPU Frequency Selector Applet
CPU-Z - CPU-Z is a freeware that gathers information on some of the main devices of your system : Processor name and number, codename, process, package, cache levels.
AIDA64 - AIDA64 is a system information, diagnostics and benchmarking solution for Windows PC.
Udev Discover - A helping tool for udev testers, coders, hackers and consumers.
Speccy - Speccy - find the details of your computer's specs. Great for spotting issues or finding compatible upgrades. Download the latest version free.
Quick Shortcut Maker App - Quick Shortcut Maker app provides features to help users create as many shortcuts as they want to take full control of their handheld device and test the device to its extent.