cdnjs is a free distributed JS library delivery service.
Django is a Python-based free and open-source web application framework.
Heroku is a cloud platform as a service (PaaS) supporting several programming languages.
jQuery is a JavaScript library which is a free, open-source software designed to simplify HTML DOM tree traversal and manipulation, as well as event handling, CSS animation, and Ajax.
OWL Carousel is an enabled jQuery plugin that lets you create responsive carousel sliders.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.