openDesk
Germany's government-built alternative to Microsoft 365. A Kubernetes-based suite integrating Nextcloud, Element, OpenProject and Collabora, stewarded by a state-owned company for the public sector.
Office Suites
Category: Office Suites under Digital Workplace
LibreOffice
Mature open-source desktop office suite for documents, spreadsheets and presentations. Fully offline, no per-seat licence, native OpenDocument format, the standard exit route from Microsoft format lock-in.
CryptPad
Zero-knowledge encrypted office suite (docs, sheets, slides, forms): the server stores only ciphertext, so even the admin can't read your files. AGPL, EU-based; the full suite is free, only managed hosting is paid.
Collabora Online
The sovereign alternative to Microsoft 365. High-security, ISO 27001-certified online office suite designed for data sovereignty and government-grade privacy.