EZproxy is a web server and a reverse proxy that is usually used by libraries as a reverse proxy in front of electronic educational resources databases (e.g.: Scopus, PubMed, or Web of Science) in order to provide authentication and protect privacy.
Facebook pixel is an analytics tool that allows you to measure the effectiveness of your advertising.
Modernizr is a JavaScript library that detects the features available in a user's browser.
Open Graph is a protocol that is used to integrate any web page into the social graph.