Yeah, that'd be DD-WRT. It's what makes Tomato possible. Tomato, by the way, is cool until it isn't - things are great until you hit its device limit (which seems to be, like, "ten") and then it chokes up so bad that it pushes your ping times up to like 30s.
Unifi is dope. The one thing that's extra special stupid, is you can hit your cloud key from anywhere. You can hit your cloud key from your other cloud key. You can set up VPN stupid easy. But unless you have two static IPs, you can't VPN from cloud key to cloud key.