There are actually a great many efforts in this regard. You mention Freedom box and Sandstorm, which are only two of them. I'm working on http://nymote.org http

There are actually a great many efforts in this regard. You mention Freedom box and Sandstorm, which are only two of them. I'm working on http://nymote.org http://nymote.org and it'll be built using Unikernels (specifically, Mirage OS - http://openmirage.org http://openmirage.org). Targeting the home router is something we've been working on for some time but the work stretches from deep tech to human-computer interaction. Most of this work is in academia for now but as soon as there are business models that work, we expect to see real deployments (beyond the hobbyists).