Flatiron is an unobtrusive framework initiative for node.js. It promotes code organization and sustainability by clearly separating development concerns. Each component works elegantly with or without its counterparts. Many of the components work the same in the browser as they do on the server.
It is an initiative to build a collection of decoupled tools with the same standard of quality and performance that you would expect from anything built by nodejitsu (intelligent & scalable Node.js).