Apache is a free and open-source cross-platform web server software.
cdnjs is a free distributed JS library delivery service.
Heroku is a cloud platform as a service (PaaS) supporting several programming languages.
Ionicons is an open-source icon set crafted for web, iOS, Android, and desktop apps.
jQuery UI is a collection of GUI widgets, animated visual effects, and themes implemented with jQuery, Cascading Style Sheets, and HTML.
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.
MathJax is a cross-browser JavaScript library that displays mathematical notation in web browsers, using MathML, LaTeX and ASCIIMathML markup.
PHP is a general-purpose scripting language used for web development.
Popper is a positioning engine, its purpose is to calculate the position of an element to make it possible to position it near a given reference element.