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
AdwCleaner - AdwCleaner is a free removal tool for : Adware (ads softwares)
SonicWall - SonicWall security solutions protects your network, systems, users and data from cyber threats.
Spybot - Search & Destroy - Spybot Search & Destroy is an anti-malware, adware and antivirus program for safe removal of the threats from the PC and browser.
pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more