I've created a list of software that I normally use for testing and setting up computers. Feel free to add more:
CPU
- CPU-Z (monitoring)
- RealTemp370 (temp monitoring)
- Prime95 (stability)
- Super-Pi (benchmarking)
GPU
- GPU-Z (monitoring)
- Furmark (stability)
GPU Benchmarking:
- 3dMark03 - 2011 (http://www.futuremark.com/benchmarks/3dmark/all)
- Aquamark (http://downloads.guru3d.com/download.php?det=673)
- Unigine (http://unigine.com/)
- Lightsmark (http://dee.cz/lightsmark/)
- Passmark (http://www.passmark.com/index.html)
HDD Benchmarking
- Crystal Disk Info
- Crystal Disk Mark
- HD Tune 254
- IOMeter
System
- CPUID_HW (monitor / temp monitor)
- WHM Blackbox (monitor / benchmarking
- PC Wizard (monitor)
- PC Mark (http://www.futuremark.com/benchmarks/pcmark)
- Passmark (http://www.passmark.com/products/index.htm)
- NovaBench (???)
- SiSoft Sandra
please add to the list if I may have missed anything.