Seafile
Open source file sync, sharing, and cloud storage platform with client-side encryption
Alternative to: dropbox, google drive, onedrive, box
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Seafile is an open source cloud storage system with privacy protection and teamwork features. Files are organized into libraries that can be synced and shared independently, with optional client-side encryption for privacy. It supports selective syncing, file version history, group collaboration, and built-in document and wiki tools for team knowledge management.