AngularJS is a JavaScript-based open-source web application framework led by the Angular Team at Google.
Websites that have a shopping cart or checkout page, either using a known ecommerce platform or a custom solution.
Express is a web application framework for Node.js, released as free and open-source software under the MIT License. It is designed for building web applications and APIs.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.