CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
Glary Utilities - The No. 1 Free, Powerful and All-in-one utility for cleaning your PC
Pegasun System Utilities - Pegasun System Utilities is one of the best means for enhancing the performance of the PC.
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.
Wise Care 365 - Wise Care 365 is a bundle of important registry, disk, and other system utilities for your PC.
Clean Master - Some users swear by it, some call it a glorified snake oil that does more harm than good. That can be said about any snake oil, but what specific brand of snake oil can boast almost a billion downloads around the world?