WeTransfer - WeTransfer is a free service to send big or small files from A to B.
Bashupload - Upload files from command line to share between servers
Dropbox - Online Sync and File Sharing
FilePizza - Open source application used to transfer file via WebRTC and WebTorrent.
Send Anywhere - Send whatever you want, wherever you want
BlackHole File Transfer - Blockchain-based file transfer. Designed for everyday use.