Syncany - Syncany is an open-source cloud storage and filesharing application.
SHAREit - SHAREit allows you to transfer files and data from your phone to another device without having to rely on WiFi or a data plan.
Filestash - Filestash is a modern client for FTP, SFTP, S3, WebDAV, Minio,...
XShare - XShare – File Fast Transfer developed and published by Shalltry Groups.
Dropbox - Online Sync and File Sharing
Send Anywhere - Send whatever you want, wherever you want