appmetrics.js A small (1.5KB gzip) library for measuring things in your web app, annotating the DevTools timeline, and reporting the results to Google Analytics. This library is a small wrapper around the the User Timing API. It makes it easier to use. appmetrics.
Go ahead and try it by clicking the "Demo" button above! For more documentation, checkout the official repo. If you're really feeling fiesty, you can check out the kid who made this.
Minoru First Name Middle Name Last Name
Library to detect when DOM elements become visible and disappear on scroll. You can download the code from the github repository or install the npm package as huntjs.
Smartcrop.js implements an algorithm to find good crops for images. Image: https://www.flickr.com/photos/endogamia/5682480447/ by N. Feans