1. CCleaner: CCleaner is a free, easy-to-use Windows and Mac utility that frees up disk space and RAM, cleans out junk files, and helps boost system performance.
2. Malwarebytes: Malwarebytes is a free anti-malware and anti-spyware program that can help protect your computer from malicious and potentially unwanted software.
3. IObit Advanced System Care: Advanced System Care is a free PC optimization tool that helps to clean, optimize and speed up your system for improved performance.
4. Auslogics BoostSpeed: BoostSpeed is a free software program designed to help users optimize their computers for speed and performance.
5. Glary Utilities: Glary Utilities is a free system maintenance tool that provides a one-stop solution for cleaning up, optimizing, and protecting your system.