CPU Frequency Selector - Cinnamon CPU Frequency Selector Applet
SYS Informer - Computer diagnostics, hardware monitoring, network audit, and benchmarking.
SiSoftware Sandra - SiSoftware Sandra (the System ANalyser, Diagnostic and Reporting Assistant) is an information &...
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.
PC Wizard - THIS SOFTWARE IS NO LONGER MAINTAINED.PC-Wizard is an utility designed to analyze and benchmark your computer system. CPU and memory subsystem (caches, RAM ...). Graphics and video. Hard disks, CD/DVD, Removable/FLASH medias.
Open Hardware Monitor - Monitors temperature sensors, fan speeds, voltages, load and clock speeds, with optional graph.