TinyWall - Lightweight and non-intrusive firewall
CacheGuard-OS - CacheGuard is an enterprise grade Web Gateway solution offering Web Security & Optimization in the same box. Price starting at $99 per Year!
Emsisoft Online Armor Firewall - Emsisoft Online Armor Firewall is a freemium online firewall protection system by the Emsisoft that is based on the own independent protection technology of the Emsisoft.
PC Tools Firewall Plus - PC Tools Firewall Plus Free Edition is a powerful personal free firewall for Microsoft Windows that protects your computer from hackers and intruders. Firewalls
Windows Firewall Control - Windows Firewall Control is not the built in firewall system in the Windows operating systems.
Looknstop - Look n Stop is the best in its class security application to prevent spyware.