Annotable - Ultimate image annotation & markup tool
Dropbox - Online Sync and File Sharing
marker.js Live - marker.js Live is a companion library for marker.js 2 enabling dynamic representation of image annotations.
Box - Box offers secure content management and collaboration for individuals, teams and businesses, enabling secure file sharing and access to your files online.
Drift - A messaging app that helps you grow your business.
WeTransfer - WeTransfer is a free service to send big or small files from A to B.