AIDA64 - AIDA64 is a system information, diagnostics and benchmarking solution for Windows PC.
Prime95 - Prime95 is a program that searches for new Mersenne prime numbers.
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.
HeavyLoad - The individual test methods employed by HeavyLoad can be customized to fit your needs.
Novabench - NovaBench is a piece of analytical software that works to test the various limits of your computer. The software is completely free to use, and it runs at a lightning-fast pace. Read more about Novabench.
System Stability Tester - System Stability Tester - Test your system's stability and performance by calculating millions of digits of Pi.