AngularJS lets you write client-side web applications as if you had a smarter browser. It lets you use good old HTML (or HAML, Jade and friends!) as your template language and lets you extend HTML’s syntax to express your application’s components clearly and succinctly. It automatically synchronizes data from your UI (view) with your JavaScript objects (model) through 2-way data binding.

Lots of people use React as the V in MVC. Since React makes no assumptions about the rest of your technology stack, it's easy to try it out on a small feature in an existing project.

jQuery is a cross-platform JavaScript library designed to simplify the client-side scripting of HTML.

It is a library for building interactive web interfaces. It provides data-reactive components with a simple and flexible API.

Whether you're building highly interactive web applications or you just need to add a date picker to a form control, jQuery UI is the perfect choice.