lazyembed.js is a lazy loading library for iframe embedded content such as Youtube/Vimeo videos, Google Maps, etc. The library delays the loading of these iframe content until clicked, with custom placeholder support.
A pure CSS library that recreates the Google loading indicators (loaders, loading spinners) with pure CSS/CSS3.
Three Dots is a small CSS/CSS3 library that provides a set of 19 fancy animated loading spinners created with three dots.
lazysizes is an easy yet robust JS library used to delay the loading of images (iframes, scripts, etc) until they come into view.
A minimalist page scroll indicator to visualize the scroll position (how much the user has scrolled) in a slim progress bar. Fully customizable via CSS.
The material-loading lets you create a fullscreen loading screen for official Material Design Lite framework.