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.

Pushbullet - Pushbullet - Your devices working better together

Dropover - Mac app for easier drag & drop

blymp.io - Transfer files between any device with 4-digit codes

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.

Plover - Browser Airdrop - transfer files to anyone, any device