DiskPatch - Did the entire hard disk go blank? Does Windows complain that the volume needs to be formatted?
CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
Recuva - Accidentally deleted an important file? Lost files after a computer crash?
Glary Utilities - The No. 1 Free, Powerful and All-in-one utility for cleaning your PC
Free Data Recovery Mate - Free File Data Recovery Software provides 4 recover modes
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.