Geekbench - Geekbench 4 measures your hardware's power and tells you whether your computer is ready to roar. How strong is your mobile or desktop system?
CPU Frequency Selector - Cinnamon CPU Frequency Selector Applet
UserBenchMark - Test, fix and upgrade your PC's performance.
AIDA64 - AIDA64 is a system information, diagnostics and benchmarking solution for Windows PC.
3DMark - 3DMark includes everything you need to benchmark your hardware in one app.
Udev Discover - A helping tool for udev testers, coders, hackers and consumers.