Palo Alto Networks WildFire - Firewall and Threat Intelligence
WatchGuard XTM - Discontinued Product - WatchGuard Technologies is strongly committed to providing industry-leading products and services.
FireEye Security Suite - An enterprise-grade security solution for mid-market customers, combining detection, protection, and response capabilities for network, email and endpoint.
pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more
Zscaler Web Security - Zscaler offers cloud-based web security solutions.
ClearOS - A very good alternative for Windows Server, for free