Prime95 - Prime95 is a program that searches for new Mersenne prime numbers.
Linpack Xtreme - Linpack Xtreme is a benchmark and the most aggressive stress testing software available today.
HeavyLoad - The individual test methods employed by HeavyLoad can be customized to fit your needs.
SuperPI - Super PI is a single threaded benchmark that calculates pi to a specific number of digits.
CPU Frequency Selector - Cinnamon CPU Frequency Selector Applet
AIDA64 - AIDA64 is a system information, diagnostics and benchmarking solution for Windows PC.