pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more
ARM Mbed OS - The Arm® Mbed™ IoT Device Platform provides the operating system, cloud services, tools and developer ecosystem to make the creation and deployment of commercial, standards-based IoT solutions possible at scale.
Zentyal - Linux directory, domain, mail, gateway and infrastructure server for SMBs.
LynxOS - LynxOS is a Unix-like real-time operating system designed for controlling and monitoring laboratory instruments.
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.