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
Kaspersky AntiVirus - Download the best FREE antivirus for Windows-based desktops, laptops, & tablets and get the core protection against viruses, spyware, phishing & dangerous websites.
SonicWall - SonicWall security solutions protects your network, systems, users and data from cyber threats.
Windows Defender - Windows 10 security delivers built-in & ongoing protections you can trust: Windows Defender Antivirus, firewall, family settings, ransomware protection, real-time protection & more. Stay up to date & protected at no extra cost.
pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more