Nextcloud
Open SourceNextcloud is an open-source, self-hosted platform for file synchronization, sharing, and collaboration. It provides a private alternative to commercial cloud storage services, offering a comprehensive suite of tools including file management, calendar, contacts, and notes, all under your control.
Key Features
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Complete control and ownership of your data through self-hosting.
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Strong focus on privacy, security, and open standards.
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Extensive functionality through a wide range of installable applications.