Isomorphic JavaScript: The Future of Web Apps – Airbnb Engineering

This idea isn’t new — Nodejitsu wrote a great description of isomorphic JavaScript architecture in 2011 — but it’s been slow to adopt. There have been a few isomorphic frameworks to spring up already. Mojito was the first open-source isomorphic framework to get any press. It’s an advanced, full-stack Node.js-based framework, but its dependence on YUI and Yahoo!-specific quirks haven’t led to much popularity in the JavaScript community since they open sourced it in April 2012.
http://nerds.airbnb.com/isomorphic-javascript-future-web-apps/

A JavaScript library for building user interfaces | React

Just the UI Lots of people use React as the V in MVC. Since React makes no assumptions about the rest of your technology stack, it’s easy to try it out on a small feature in an existing project. Virtual DOM React abstracts away the DOM from you, giving a simpler programming model and better performance. React can also render on the server using Node, and it can power native apps using React Native. Data flow React implements one-way reactive data flow which reduces boilerplate and is easier to reason about than traditional data binding.
https://facebook.github.io/react/