WeTransfer - WeTransfer is a free service to send big or small files from A to B.
Dropbox - Online Sync and File Sharing
Send Anywhere - Send whatever you want, wherever you want
Mega - Secure File Storage and collaboration
Wormhole.app - Wormhole lets you share files with end-to-end encryption and a link that automatically expires.
Hightail - The professional way to send & share files and folders with anyone