Malwarebytes - Malwarebytes protects you against malware, ransomware, and other advanced online threats that have made antivirus obsolete and ineffective. Free Anti-Malware & Malware .
CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
360 Total Security - 360 Total Security was created by Qihoo 360 Technology Co. Ltd. This Chinese-based company provides a number of software solutions for PC, mobile devices and online security. Read more about 360 Total Security.
Glary Utilities - The No. 1 Free, Powerful and All-in-one utility for cleaning your PC
Microsoft Security Essentials - Microsoft Security Essentials is Microsoft's own foray into the world of virus protection.
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.