Filestash - Filestash is a modern client for FTP, SFTP, S3, WebDAV, Minio,...
SpiderOak - SpiderOak makes it possible for you to privately store, sync, share & access your data from everywhere.
FTPbox - FTPbox is an open-source application that allows you to synchronize your files to your own host...
Duplicati - Free backup software to store backups online with strong encryption. Works with FTP, SSH, WebDAV, OneDrive, Amazon S3, Google Drive and many others.
ownCloud - ownCloud is an open source project enabling businesses to host their own cloud storage while maintaining regulatory and compliance needs.
CrashPlan - CrashPlan for Small Business backup software offers the best way to back up and store business & enterprise data securely - offsite, onsite & online in the Cloud.