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.
Leaflet is the open-source JavaScript library for mobile-friendly interactive maps.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Plone is a free and open source content management system (CMS) built on top of the Zope application server.
Python is an interpreted and general-purpose programming language.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.