Digicert - Encryption & Authentication
Malwarebytes - Malwarebytes protects you against malware, ransomware, and other advanced online threats that have made antivirus obsolete and ineffective. Free Anti-Malware & Malware .
Comodo - Comodo, the leading Internet Security Provider offers Free Antivirus, SSL Certificate and other Internet Security related products with complete protection
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.
Let's Encrypt - Let’s Encrypt is a free, automated, and open certificate authority brought to you by the Internet Security Research Group (ISRG).
Microsoft Security Essentials - Microsoft Security Essentials is Microsoft's own foray into the world of virus protection.