Ccleaner

 

Description:

CCleaner is the number-one tool for cleaning your Windows PC. It protects your privacy online and makes your computer faster and more secure. Easy to use and a small, fast download.it was developed by Piriform is a Utility program used to clean potentially unwanted files and invalid Windows Registry entries from a computer.

7-Zip

 

Description:
7-Zip is open source software. Most of the source code is under the GNU LGPL license. The unRAR code is under a mixed license: GNU LGPL + unRAR restrictions. You can use 7-Zip on any computer, including a computer in a commercial organization. You don't need to register or pay for 7-Zip.