1)   Comodo Personal Firewall 3.0.14.276
FREE Comodo Firewall Pro - Secures your system against internal attacks and external attacks by hackers. Safeguard your personal data through a simple user friendly single click interface. Connect to the internet with total peace of mind for Free!

 2)   Comodo Memory Firewall 2.0.4.20
Free Comodo Memory Firewall protects against data theft, computer crashes and system damage by preventing buffer overflow attacks. It protects your system by detecting suspicious code executions in the stack or heap section of your computer memory

 3)   Kool Firewall 2.43.111
Kool Firewall is firewall security software designed to monitor the traffic into and out of your system. Kool Firewall has built-in algorithms to detect malacious or unauthorized access to your computer.

 4)   Online Armor Personal Firewall Free 2.1.0.131
Online Armor FREE provides a blend of usability and hard-wired PC security to ensure a good user experience. Provides 100% leak protection out of the box.