CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
SysTracer - SysTracer - track registry and file system changes in your computer
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.
Advanced Registry Tracer - Analyze changes made to the Windows Registry.
AVG PC TuneUp - Peak performance for your PC. Keeps it going for longer. - More Speed Turbo Mode
RegistryChangesView - Compare 2 snapshots of Windows Registry, display all changes, and optionally generate .reg file.