At work, we have just launched a new tool called Monkeypod that allows easy design of REST APIs in a browser. It automatically creates Swagger documentation and a virtualized version of the API serving dummy data instantly. We're finding it very helpful internally, and wanted to open it up to the community for a private beta. Please sign up if you do work with APIs and give us your feedback.
Sign up at http://monkeypod.io
Follow Monkeypod on Twitter at http://twitter.com/monkeypodio
Monkeypod is written using MongoDB, Swagger, Scala, Akka, Casbah, and a lot of the techniques that I have written about in this blog. I'll do a deeper technical architecture dive at some point, but if you'd like to read more about the project, please check out http://bit.ly/1uHBuoq