cdnjs is a free distributed JS library delivery service.
Jekyll is a blog-aware, static site generator for personal, project, or organisation sites.
MathJax is a cross-browser JavaScript library that displays mathematical notation in web browsers, using MathML, LaTeX and ASCIIMathML markup.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Paper.js is an open-source, vector graphics scripting framework, which offers a powerful Scene Graph and extensive functionality to create and manipulate graphic items using layers, gradients, blending, and other advanced features
Unpkg is a content delivery network for everything on npm.