DropzoneJS is an open source library that provides drag’n’drop file uploads with image previews.

Flat, simple, multi-themed, responsive and hackable Color-Picker library. No dependencies, no jQuery. Compatible with all CSS Frameworks e.g. Bootstrap, Materialize. Supports alpha channel, rgba, hsla, hsva and more!

GreenSock is a JavaScript plateform which makes it easy to animate HTML elements. As long as you have an understanding of HTML and CSS, along with a basic knowledge of JavaScript, you’ll be equipped with everything you need to build your animation with Greensock.