Dropbox - Online Sync and File Sharing
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Box - Box offers secure content management and collaboration for individuals, teams and businesses, enabling secure file sharing and access to your files online.
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
WeTransfer - WeTransfer is a free service to send big or small files from A to B.
LightShot - The fastest way to take a customizable screenshot.