I see Mikrotik does have an open source repo on Github, but it's not clear if you could really build a working OS from it. That's another platform I'd love to

I see Mikrotik does have an open source repo on Github, but it's not clear if you could really build a working OS from it. That's another platform I'd love to see go open source with as required binary blobs for the network bits. In particular to see how updating their kernel to something recent benefits performance; their patches are for kernel 3.3.x.