Nextcloud

self-hosted productivity platform which provides private and secure functions for file sharing, collaborative work, and more ; includes the Nextcloud server, client applications for desktop computers, and mobile clients

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Nextcloud is a modular workspace platform designed to provide teams and businesses with a comprehensive environment for digital collaboration. Beyond central data management, it integrates office suites like Collabora Online and EuroOffice for seamless, cooperative workflows. The platform features built-in tools for chat, videoconferencing, and a privacy-focused AI assistant capable of running entirely on local LLMs. Supported by a rich ecosystem of apps, it can be hosted in the cloud or on premises and can scale up to millions of users. It has been translated into over 100 languages.

from Wikipedia