FileRoom.io - Browser airdrop to send files to anyone, on any device
WeTransfer - WeTransfer is a free service to send big or small files from A to B.
Plover - Browser Airdrop - transfer files to anyone, any device
Send Anywhere - Send whatever you want, wherever you want
Droplr - Droplr is a tiny application that aims at helping people share things easier.
Wormhole.app - Wormhole lets you share files with end-to-end encryption and a link that automatically expires.