pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more
Zentyal - Linux directory, domain, mail, gateway and infrastructure server for SMBs.
SonicWall - SonicWall security solutions protects your network, systems, users and data from cyber threats.
NethServer - NethServer is an operating system for Linux enthusiasts, designed for small offices and medium...
MikroTik RouterOS - The main product of MikroTik is a Linux-based operating system known as MikroTik RouterOS.
OPNsense - OPNsense® you next open source firewall. Free Download. High-end Security Made Easy™. Offers Intrusion Prevention, Captive Portal, Traffic Shaping and more.