CPU Frequency Selector - Cinnamon CPU Frequency Selector Applet
lsscsi - Uses information in sysfs (Linux kernels 2.6.
Udev Discover - A helping tool for udev testers, coders, hackers and consumers.
cpuid - cpuid dumps detailed information about the CPU(s) gathered from the CPUID instruction, and also...
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.
Speccy - Speccy - find the details of your computer's specs. Great for spotting issues or finding compatible upgrades. Download the latest version free.