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pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more
OPNsense - OPNsense® you next open source firewall. Free Download. High-end Security Made Easy™. Offers Intrusion Prevention, Captive Portal, Traffic Shaping and more.
F5 Advanced Firewall Manager - Stop even the most massive and complex DDoS attacks with BIG-IP Advanced Firewall Manager: advanced data center protection against layer 3–4 threats.
IPFire - IPFire is a server distribution with intended to use as a firewall.
FireMon - FireMon Security Intelligence Platform delivers continuous visibility into and control over firewall infrastructure.
ClearOS - A very good alternative for Windows Server, for free