Nextcloud is an open-source platform for file storage, synchronization, and collaboration, self-hosted and used by thousands of organizations worldwide. It allows you to keep your files, contacts, calendars, and data on your own server, then synchronize them across all your devices (desktop, mobile, web) and share them with fine-grained access control (password-protected links, expiration dates, granular permissions).

Beyond simple file sharing, Nextcloud offers a complete suite of integrated tools: Nextcloud Talk (video conferencing, messaging, and screen sharing on-site), Nextcloud Groupware (calendar, contacts, mail), and Nextcloud Office (online collaborative document editing based on LibreOffice). Its extensible applications logic allows you to add hundreds of features as needed.

Nextcloud emphasizes data sovereignty and compliance: encryption, auditing, two-factor authentication. It targets businesses and public administrations that want to maintain total control over their information rather than relying on a third-party cloud.