WeTransfer - WeTransfer is a free service to send big or small files from A to B.
Dropbox - Online Sync and File Sharing
ownCloud - ownCloud is an open source project enabling businesses to host their own cloud storage while maintaining regulatory and compliance needs.
Hightail - The professional way to send & share files and folders with anyone
Google Drive - Access and sync your files anywhere
Mega - Secure File Storage and collaboration