cdnjs is a free distributed JS library delivery service.
chroma.js is a small-ish zero-dependency JavaScript library for all kinds of color conversions and color scales.
Google Analytics is a free web analytics service that tracks and reports website traffic.
Open Graph is a protocol that is used to integrate any web page into the social graph.
reCAPTCHA is a free service from Google that helps protect websites from spam and abuse.
Tiny Slider is a vanilla javascript slider for all purposes.