CleanMyMac X - Clean, protect and speed up your Mac
Speccy - Speccy - find the details of your computer's specs. Great for spotting issues or finding compatible upgrades. Download the latest version free.
DaisyDisk - DaisyDisk is a disk analyzer tool for OS X that visualizes hard disk usage and allows to free up hard disk space.
HWiNFO - Professional System Information and Diagnostics. Comprehensive Hardware Analysis, Monitoring and Reporting for Windows and DOS. FREEWARE. download. Advertisements.
Fossils - Find and clean out all your old unused files
AIDA64 - AIDA64 is a system information, diagnostics and benchmarking solution for Windows PC.