CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.
Avast Cleanup - Next generation tuneup and cleanup for your PC
AVG PC TuneUp - Peak performance for your PC. Keeps it going for longer. - More Speed Turbo Mode
Advanced System Optemizer - Clean, optimize and personalize your PC
Advanced SystemCare - Free optimization software & registry cleaner for Windows 10, 8, 7, Vista and XP. Advanced SystemCare Free to speed up PC, clean registry and repair system in one click.