Belarc Advisor
- Tells you in detail all about your hardware, software, patch status, security settings, networking inventory, and more
- Aimed at individual home users
HWinfo
- Provides very detailed information about your hardware
- Provides real time tracking of things such as temperature and power usage
Prime95 and MemTest86+
- Prime95 uses your processor to calculate extremely large prime numbers
- MemTest86 + taxes your RAM with several different memory straining algorithms
MSI Afterburner
- Squeeze out every last pixel out of your video and do it without melting your motherboard
- Popular graphics-card overclocking and monitoring programs
TreeSizeFree
- Runs scan of all your internal drives to see what files are taking space and where they are
Recuva
- Restores deleted items from all local drives including USB memory sticks, memory cards, and regular drives.
- Securely deletes files and makes them impossible to recover
Autoruns
- Notifies of everything that loads on top of Windows when you start your computer and lets you decide whether you want it or not
Process Explorer and Process Manager
- Both give you in-depth information on everything running on your system
- Process Explorer is like a Turbocharged Task Manager replacement
- Process Manager features real-time monitoring of all process operations
BitMeter OS and Wireshark
- BitMeter provides real-time bandwidth analysis in a slick, user-friendly package that is easy for anyone to understand
- Wireshark provides information about every single piece of data entering and leaving your computer. It used more by security professionals and intermediate users