Dropbox - Online Sync and File Sharing
Send Anywhere - Send whatever you want, wherever you want
Syncthing - Syncthing replaces proprietary sync and cloud services with something open, trustworthy and...
WeTransfer - WeTransfer is a free service to send big or small files from A to B.
ownCloud - ownCloud is an open source project enabling businesses to host their own cloud storage while maintaining regulatory and compliance needs.
Oficloud - File Sharing with enhanced privacy and security