WeTransfer - WeTransfer is a free service to send big or small files from A to B.
Polymail - Native email app for email productivity.
Send Anywhere - Send whatever you want, wherever you want
HEY - Email at its best, new from Basecamp.
Wormhole.app - Wormhole lets you share files with end-to-end encryption and a link that automatically expires.
Canary Mail - Privacy-aware email app for Mac & iOS