CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
CleanMyMac X - Clean, protect and speed up your Mac
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.
WinZip System Utilities Suite - Top-rated PC utility software to clean, update, maintain and protect your PC for good. Free Download for Windows and Mac.
AVG PC TuneUp - Peak performance for your PC. Keeps it going for longer. - More Speed Turbo Mode
Avast Cleanup - Next generation tuneup and cleanup for your PC