SDelete - Securely overwrite your sensitive files and cleanse your free space of previously deleted files using this DoD-compliant secure delete program.
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.
Wise Disk Cleaner - Clean junks of Browsers, remove junk and useless files of Windows and Defragment your disk. Wise Disk Cleaner can delete these unnecessary files on your hard disk to free up disk space and make your computer run faster.
CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
Kerish Doctor - Kerish Doctor 2015 is an all-in-one solution for automatic maintenance of Windows-based computers.
Tron Script - Tron is a glorified collection of batch files that automate the process of cleaning up Windows systems.