IPFire is a hardened open source Linux distribution that primarily performs as a router and a firewall; a standalone firewall system with a web-based management console for configuration. IPFire originally started as a fork of IPCop and has been rewritten on basis of Linux From Scratch since version 2. It supports installation of add-ons to add server services, which can be extended into a SOHO server. In April 2015, the project became a member of the Open Invention Network.
There’s a button on the website that advertises their appliances which is a red flag. Their software is trade-free though.