Lozad.js - Highly performant lazy loader in pure JS
Dropzone - If you want your file uploads to work even without JavaScript, you can include an element with the class fallback that dropzone will remove if the browser is supported.
Dragula - A drag and drop library for developers
Dropover - Mac app for easier drag & drop
JSconsole - Load external JS libraries in your favorite console
Unclutter - Unclutter is an app that is designed to help Mac users bring order to their desktop. Among other features, this powerful piece of software provides quick access to a user's notepad and clipboard.