I believe vyatta is their base.

Brian-Puccio · on Aug 18, 2015

I think it's v6.3 of vyatta they've forked. Vyatta being debian based, so is EdgeOS.

There's also this conversation regarding Ubiquiti's GPL issues from the past:

https://news.ycombinator.com/item?id=9331512

I've for three ERL's (one at home, two elsewhere) and they've been great so far. But I run their firmware, not OpenBSD, so I can't comment about it much. I also use their APs and I'm thinking of getting their IP cameras.

_yy · on Aug 18, 2015

Not always.

detaro · on Aug 18, 2015

But for the product discussed here it is. (They actually hired some of the Vyatta devs to work on it, since the upstream project seems to be left to die at Brocade)

ddeck · on Aug 18, 2015

since the upstream project seems to be left to die at Brocade

Indeed, Brocade closed sourced the main product in 2012 and left the community edition to die.

Thankfully the Vyatta core was forked in 2013 (renamed VyOS) and is under active development as a free open source project. [1]

[1] http://vyos.net/wiki/Main_Page