Sails.js is a web framework that makes it easy to build custom, enterprise-grade Node.js apps. It is designed to resemble the MVC architecture from frameworks like Ruby on Rails, but with support for the more modern, data-oriented style of web app development. It's especially good for building realtime features like chat.
Sails controllers are compatible with Connect middleware, so in most cases, you can paste code into Sails from an existing Express project and everything will work-- plus you'll be able to use WebSockets to talk to your API, and vice versa.
Back in 2012, we were designing/builing scalable Node.js apps for startups and enterprise customers. After building a few applications and taking them into production, we realized that the Node.js development landscape was very much still the Wild West. Over time, after trying lots of different methodologies, we decided to crystallize all of our best practices into this framework. Four years later, Sails is now one of the most widely-used web application frameworks in the world. We hope it saves you some time! :)
Sails is built around so many great open-source technologies that it would never have crossed our minds to keep it proprietary. We owe huge gratitude and props to TJ Holowaychuk (@visionmedia) and Guillermo Rauch (@rauchg) for the work they've done, as well as the stewards of all the other open-source modules we use. Sails could never have been developed without your tremendous contributions to the node community.