Google Analytics is a free web analytics service that tracks and reports website traffic.
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.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.