You missed to mention Duda I/O:

   http://duda.io

On this case this framework target web services, you can do web development but the goal is to be a fast HTTP/Websocket stack instead of a friendly MVC renderer.

Even is do in C, i tries to present a friendly C API as you can see in http://duda.io/api, if you think into a fast big data server front-end, Duda I/O fits pretty well. A few slides:

    http://duda.io/slides/