OpenWrt - OpenWrt is an open-source firmware based on Linux for wireless routers
MikroTik RouterOS - The main product of MikroTik is a Linux-based operating system known as MikroTik RouterOS.
Gargoyle - Gargoyle Router Firmware home page
pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more
Tomato by Shibby - TomatoUSB fork. - Torrent client integration (Transmission) with user-friendly GUI for configurat...
libreCMC - The libre Embedded GNU/Linux Distro.