Euro-Office launches as an open-source rival to Microsoft 365 and Google Workspace

A coalition of European software makers has shipped the first stable version of Euro-Office, an open-source web office suite built as a sovereign alternative to Microsoft 365 and Google Workspace. The 1.0 release landed on 9 June 2026, bundled into Nextcloud Hub 26.

Euro-Office covers the everyday productivity stack — documents, spreadsheets, and presentations — alongside file sync, mail, calendar, and collaboration tools drawn from the partners’ existing products. The editors are a fork of ONLYOFFICE, chosen for its browser-based architecture, with open standards such as ODF supported out of the box and desktop and mobile apps planned.

The project is led by Germany’s Nextcloud and IONOS, with Open-Xchange, XWiki, OpenProject, Eurostack, Soverin, Abilian, BTactic, and the Dutch vendor Office.eu among the partners; Proton and Tuta also sit under the umbrella. Each is committing developers, and the consortium frames the suite as European-hosted infrastructure that keeps data inside the EU.

The launch is part of a wider European push for digital sovereignty in public administration, where dependence on US cloud suites has become a political concern. IONOS plans a managed offering later this summer, and Office.eu will host consumer-facing products.

For the European-alternatives angle, Euro-Office matters less as a single product than as a bundle of tools many of which already stand on their own: XWiki as a Confluence alternative, ONLYOFFICE Document Editor against Google Docs, and Nextcloud’s file and collaboration suite. Stitched together, they amount to the most complete open, European answer yet to the dominant US productivity clouds.