Samurai Showdown is a decent fighter

I used pfSense for years and switched to OpenWRT. I highly recommend OpenWRT. pfSense is kinda trash IMHO. I tried to set up traffic shaping, so I could play games while my roommate was watching Netflix, and it just doesn’t work as advertised. I tried like 20 different configurations for the traffic shaping, following all the documentation, guides, countless forum threads, etc, and none of it worked properly when you actually test it. At the end of the day, I concluded that nobody understands how to configure traffic shaping on it and even the developers didn’t realize it was broken.

OpenWRT, on the other hand, just works better out of the box, and has the right level of customizability for home use. It has a way better ecosystem around it where you can download extra packages with GUIs… it’s just much nicer to use, and doesn’t have the QA problems I had with pfSense.

I’m late to the party here, but did you consider just paying for Mattermost? If it meets your needs, and your organization has 250 people, the cost for licensing is going to be relatively small compared to your IT budget (right?). They have “contact us” pricing, which means you can negotiate it.