CPU Frequency Selector - Cinnamon CPU Frequency Selector Applet
Process Tamer - Freeware Microsoft Windows utility that monitors the CPU use of applications, alerts when they use too much, and reduces their priority to keep your PC fast.
Udev Discover - A helping tool for udev testers, coders, hackers and consumers.
SysGauge - SysGuage is a responsive software utility that monitors the memory status, CPU usage, as well as network and disk activities of your system.
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.
SSuite System Monitor - SSuite System Monitor is a completely portable and stand-alone application that monitors the RAM of your system, page file load, CPU usage, and the system power in real-time.