SonicWall TZ - Get high-speed threat prevention in a flexible, integrated security solution with the SonicWall TZ Series.
Check Point Firewall Software Blade - Check Point delivers the best security solutions withthe right architecture to prevent attacks in allof yourenvironments.
Meraki MX Firewalls - Cloud managed networking from Cisco Meraki. The easiest and most IT-friendly solution for enterprise networking needs.
pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more
Cyberoam - Firewall
ClearOS - A very good alternative for Windows Server, for free