- Rendr from AirBnB is based mostly on backbone and backbone-style design choices
- Ezel from Artsy is also backbone-based. Blog post announcing Ezel
- flatiron from Nodejitsu uses the plates templating library which runs in both node.js and the browser
- Derby runs in both node.js and the browser
At the moment just for completeness I will note that Meteor and AngularJS are currently browser-only. I suspect both projects will have some server-side rendering options perhaps later in 2014 though.