ownCloud - ownCloud is an open source project enabling businesses to host their own cloud storage while maintaining regulatory and compliance needs.
WeTransfer - WeTransfer is a free service to send big or small files from A to B.
Syncthing - Syncthing replaces proprietary sync and cloud services with something open, trustworthy and...
Files2U - Files2U is free to use web service that permits you to share documents on the web.
Mega - Secure File Storage and collaboration
Streamfile - Exchanging documents over moment envoy are normally more miss than hit, and email limits you to 25MB at most—in case you’re both on Gmail.