Bootstrap is a free and open-source CSS framework directed at responsive, mobile-first front-end web development. It contains CSS and JavaScript-based design templates for typography, forms, buttons, navigation, and other interface components.
Django is a Python-based free and open-source web application framework.
Font Awesome is a font and icon toolkit based on CSS and Less.
Heroku is a cloud platform as a service (PaaS) supporting several programming languages.
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.