Works great - very useful
Glary Utilities - The No. 1 Free, Powerful and All-in-one utility for cleaning your PC
TinkerTool - Tinker with the hidden settings of your Mac
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.
Onyx by Titanium - This website provides operating system utilities for macOS
AVG PC TuneUp - Peak performance for your PC. Keeps it going for longer. - More Speed Turbo Mode
Cocktail - General purpose system modify/repair utility