openDesk

German government-backed open-source office and collaboration suite developed by ZenDiS (Centre for Digital Sovereignty). openDesk integrates Collabora Online for documents, Nextcloud for file storage, Open-Xchange for email/calendar, Element for messaging, Jitsi for video conferencing, and OpenProject for task management into a single sovereign workplace platform. Primarily aimed at public administration, but available to private individuals as well via the community edition.