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European & open-source alternatives to Microsoft 365

13 European and open-source alternatives to Microsoft 365 — privacy-friendly tools built and hosted in Europe.

Updated 8 Sep 2026 · refreshed weekly

German enterprise wiki built on MediaWiki by Hallo Welt! GmbH in Regensburg, adding visual editing, permissions and quality…

An open-source online office suite that allows users to view and edit documents in their browser, integrating into existing…

An open-source, end-to-end encrypted collaborative office suite that allows users to store and share files, edit rich text…

An open-source communication and collaboration platform that integrates email, calendars, contacts, tasks, chat, video meetings…

German open-source collaborative markdown editor (formerly CodiMD) with real-time co-editing, instant preview, diagrams and slide…

A Swiss technology company that provides a range of online services, including cloud hosting and productivity tools, with a focus…

Free, open-source office suite with word processing, spreadsheets and presentations, maintained by the German-based Document…

Independent Swiss email host with flat-rate, standards-based mailboxes on open-source infrastructure.

This open-source content collaboration platform provides a comprehensive environment for digital collaboration, allowing users to…

Munich team knowledge base focused on speed and simplicity, with real-time editing, a visual knowledge graph and sub-50ms page…

A cloud-based, open-source productivity suite that offers tools for documents, spreadsheets, presentations, email, calendars, and…

An online office suite that allows users to view, edit, and collaborate on documents, spreadsheets, and presentations, and also…

Finnish AI-powered contract management platform that automatically organises, archives and tracks contracts, with intelligent…