Nextcloud is an open-source content collaboration platform, described by its makers as a better Microsoft 365 for private clouds. Nextcloud Hub bundles file sync and sharing (Files), chat and video calls (Talk), groupware with calendar, contacts and mail, real-time document editing (Office), a local AI assistant and workflow automation (Flow). You run the platform on your own servers, with a hosting partner or on premises. Nextcloud Enterprise offers subscriptions with support for public sector, education and critical infrastructure, among others.
Nextcloud GmbH is based in Stuttgart, Germany. The software is released under the AGPL-3.0 and began in 2016 as a fork of ownCloud. Because you host Nextcloud yourself or through a partner, you decide where your data resides; the vendor states that you can keep data on servers you own. For a European organisation this means file storage and collaboration can remain within its own jurisdiction, depending on the hosting chosen.