Syncany - Syncany is an open-source cloud storage and filesharing application.
Dropbox - Online Sync and File Sharing
Filestash - Filestash is a modern client for FTP, SFTP, S3, WebDAV, Minio,...
Google Drive - Access and sync your files anywhere
FTPbox - FTPbox is an open-source application that allows you to synchronize your files to your own host...
ownCloud - ownCloud is an open source project enabling businesses to host their own cloud storage while maintaining regulatory and compliance needs.