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

Pushbullet - Pushbullet - Your devices working better together

Yoink - Yoink is a website that makes it easier to drag and drop images and text from one screen to another. It's a straightforward site with help along the way if you aren't sure about dragging and how to place your content.

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

Dropover - Mac app for easier drag & drop

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