LuminJS is a JavaScript library to progressively highlight any text on a page. Great for when you want users to pay attention to some important text.
Marko is a friendly and fast UI library that makes building web apps fun.
Workbox is a collection of JavaScript libraries for Progressive Web Apps by the Google Chrome team.
You can use Workbox to simplify your development by making it easy to take advantage of powerful service worker features, eliminate boilerplate code, and automate service worker generation.
Progressively is a javascript library for loading images progressively. It’s written entirely in JavaScript and super small. It will load images on when user browse to the page, saving bandwidth & server requests.
Pilpil is a tiny, pure JavaScript library for Progressive Image Loading with a blur effect to reduce the page load time; as seen on Medium.
AntiModerate is progressive image loading library with javascript.
Reduce loading time of page to less than a second on slow connections by loading and rendering nicely blurred micro images on the page while loading full sized images in background which replace as they finish.