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.

Shelfit - Worry less about juggling multiple windows or deciding where you want to store things. With Shelfit you can quickly open up a shelf, drag files in, and then when you're ready just drag them back out.

Dropover - Mac app for easier drag & drop

Droplr - Droplr is a tiny application that aims at helping people share things easier.

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.

FilePane - Enhance the power of drag-and-drop on your Mac