CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
Regshot - Quickly take a snapshot of your registry and then compare it with a second one.
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.
SysTracer - SysTracer - track registry and file system changes in your computer
AVG PC TuneUp - Peak performance for your PC. Keeps it going for longer. - More Speed Turbo Mode
Advanced Registry Tracer - Analyze changes made to the Windows Registry.