For any Backbone users out there, Marionette.js is a must-have. It’ll simplify your Backbone application code with robust views and architecture solutions. This library makes it easy to compose rich layouts with small components, share complex UI interactions across views, write classes with the same API as your views, and much, much more.
Working on that portfolio? Bespoke.js is a gorgeous presentation library that will help you show off your work (or really any information) in the best way. With several themes, elegant transitions, and additional plugins to extend the functionality, this library is a great resource to have in your toolkit.