The open source Opa Framework for JavaScript makes web development rapid and secure.
Write simultaneously the frontend and backend code, in the same language, within the same module. Even better: the Opa Slicer automates the calls between client and server. No more manually written AJAX calls or value serialization!
And when auto is not enough, add hints to the code to enforce client or server-side, privacy, synchronous or asynchronous.
Opa generates JavaScript on the server too, using Node.js and MongoDB.
Applications built with Opa can be deployed in most cloud straightforwardly and scaled up or down easily.