Palo Alto Networks WildFire - Firewall and Threat Intelligence

Check Point Firewall Software Blade - Check Point delivers the best security solutions withthe right architecture to prevent attacks in allof yourenvironments.

Cisco IronPort Web Security Appliance - Cisco IronPort Web Security Appliance

pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more

FireEye Security Suite - An enterprise-grade security solution for mid-market customers, combining detection, protection, and response capabilities for network, email and endpoint.

ClearOS - A very good alternative for Windows Server, for free