Cpukiller is described as 'CPUKILLER is a software capable of slowing down your computer up to 99% permitting you to run old software'. There are four alternatives to Cpukiller for Windows, Linux and Mac. The best alternative is HeavyLoad, which is free. Other great apps like Cpukiller are Prime95 (Free), SuperPI (Free) and StressMyPC (Free).
Super PI is a single threaded benchmark that calculates pi to a specific number of digits. It uses the Gauss-Legendre algorithm and is a Windows port of a program used by Yasumasa Kanada in 1995 to compute pi to 232 digits.
StressMyPC is stress testing software, to do a PC stability test ergo computer stress test at fully load of the hardware. Let's see! How long can your laptop battery hold a charge, or let your PC sweat! Key Features in PC Stres Test ? Stress-Test for the PC