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.
Lightbox is small javascript library used to overlay images on top of the current page.
Next.js is a React framework for developing single page Javascript applications.
Priority Hints exposes a mechanism for developers to signal a relative priority for browsers to consider when fetching resources.