Malwarebytes - Malwarebytes protects you against malware, ransomware, and other advanced online threats that have made antivirus obsolete and ineffective. Free Anti-Malware & Malware .
TinyWall - Lightweight and non-intrusive firewall
VoodooShield - VoodooShield can protect you from viruses using two different modes to “train” your computer to be...
SonicWall - SonicWall security solutions protects your network, systems, users and data from cyber threats.
OSArmor - OSArmor monitors and blocks suspicious processes on Windows
pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more