CacheGuard-OS - CacheGuard is an enterprise grade Web Gateway solution offering Web Security & Optimization in the same box. Price starting at $99 per Year!
E2Guardian - Web filtering solution
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
pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more
Looknstop - Look n Stop is the best in its class security application to prevent spyware.
Gufw - Gufw is an easy, intuitive way to manage your Linux firewall.