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Syncthing - Syncthing replaces proprietary sync and cloud services with something open, trustworthy and...
Baïkal - Cal and CardDAV server
Dropbox - Online Sync and File Sharing
Radicale - The Radicale Project is a complete CalDAV (calendar) and CardDAV (contact) server solution.
Microsoft OneDrive - Secure access, sharing & file storage
SOGo - SOGo is groupware server with a focus on scalability and open standards.