Just coming here to give Backbone.js some credit. It is one of the most mature of the frontend frameworks, because it does almost nothing. It&#x27;s what I&#x27;d call feature complete, its core probably will not change or grow much from here (in a good way). jQuery and Underscore back it, which also aren&#x27;t changing or going anywhere. And as another commenter point out, it&#x27;s 5 years old already, still in production all over the place.