Interesting.

But I see the comparisons is between Apples and Oranges here.

jQuery is a DOM library.

Angular and Ember are client-side MVC libraries.

React is an [isomorphic] UI library.

IMHO Angular/Ember and React and jQuery don't even compare in the same planes.

I'm not supporting React here, but its quite new and off late its getting a lot of traction. So the number of contributors and commits for a library that's quite new is astonishing!

And frankly I feel Angular team made a huge mistake by completely changing the syntax which makes it difficult to be adopted by anyone that knows/uses Angular 1.x.