PassMark Fragger - Passmark Fragger lets you frag and defrag files in a controlled environment according to...
CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
SpeeDefrag - SpeeDefrag is the exclusive freeware program, which optimizes Windows defrag.
Glary Utilities - The No. 1 Free, Powerful and All-in-one utility for cleaning your PC
MyDefragGUI - Windows freeware defragmentation and optimization - MyDefragGUI and the legacy JkDefragGUI.
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.