ownCloud File Sync Platform

ownCloud is an open-source enterprise file synchronization and sharing platform that enables secure collaboration, self-hosted file storage, and document sharing with granular access control. Originally created by Frank Karlitschek in 2010, forked into Nextcloud in 2016, ownCloud continues as an enterprise-focused solution with both Community Edition and Enterprise Edition. Key features include: file synchronization (cross-platform desktop clients for Windows, macOS, and Linux providing automatic file synchronization with configurable selective sync per folder), web interface (browser-based file management with upload, download, rename, move, copy, share, and preview for documents, images, and videos), sharing (share files and folders via public links with optional password protection, expiration dates, download limits, and edit permissions, plus internal sharing with users and groups), document collaboration (collaborative document editing integration with ONLYOFFICE, Collabora Online, and Microsoft Office Online for real-time co-authoring), file versioning (automatic file version history with configurable retention and restore previous versions), trash bin (deleted file recovery with configurable retention period before permanent deletion), encryption (server-side encryption for stored files with optional client-side encryption and key management), authentication (LDAP and Active Directory integration, SAML 2.0 SSO, OAuth2, and Kerberos), access control (fine-grained permissions per file and folder with group-based, user-based, and role-based access policies), mobile apps (native iOS and Android apps with automatic photo upload, file management, and offline access), audit logging (detailed audit trail of all file operations, access events, and administrative actions for compliance), and extensible architecture (app store with over 200 community apps extending functionality including calendar, contacts, tasks, and bookmarks).