Ask HN: What recent technologies have matured?

Fellow HNers.

I am thinking about creating a web app and would like to add some novelty to the process of development as the product I am thinking about (basically a specialized CMS) is nothing fancy.

I have used Ruby and written some node/express but I didn't like it, mainly due to poor documentation. Also I would like to try some fancy front-end framework and am thinking about react with backbone.

What is hot? What is going to be hot? What went under the radar? Basically I would like you to recommend me a stack.