Syncany - Syncany is an open-source cloud storage and filesharing application.
XShare - XShare – File Fast Transfer developed and published by Shalltry Groups.
Filestash - Filestash is a modern client for FTP, SFTP, S3, WebDAV, Minio,...
Zapya - Zaypa is a cross-platform transferring and sharing!
FTPSync.pl - FTPSync.pl is a PERL skript to synchronize a local directory tree and a remote FTP directory tree.
SuperBeam - SuperBeam is a file sharing app that makes moving files across devices much easier by using technologies like NFC and QR codes instead of plug ins. It is one of the fastest was to move files from one device to another.