17 open-source Office & Productivity vendors.

Open-source software for Office & Productivity that you can self-host, with auditable source code — regardless of the developer's headquarters.

• Calligra SuiteSelf-hosted / open source

  Open-source office suite by KDE e.V. (Berlin).

  Germany

• Collabora OnlineNon-EU vendor

  UK-based enterprise LibreOffice-powered online office suite for self-hosting and cloud

  United Kingdom

• CryptPadEU sovereign

  French end-to-end encrypted collaborative office suite with documents, sheets, and presentations

  France

• EGroupwareEU sovereign

  German open-source groupware suite with CRM, project management, and collaboration tools

  Germany

• EtherpadSelf-hosted / open source

  Open-source real-time collaborative text editor, widely deployed across European institutions

  United States

• Euro-OfficeSelf-hosted / open source

  Open-source, Microsoft-compatible office suite from a EuroStack consortium (IONOS, Nextcloud, XWiki, OpenProject, Soverin, Abilian, BTactic); tech preview March 2026, stable release summer 2026.

  Germany

• eXo PlatformEU sovereign

  French open-source digital-workplace platform (Paris, founded 2003) with document management and collaboration spaces, 100,000+ public-sector users.

  France

• Framasoft (Framapad/Framacalc)EU sovereign

  French non-profit association (Lyon, founded 2001) operating a free, open-source collaborative text-and-spreadsheet suite as an alternative to Google/Microsoft.

  France

• GristNon-EU vendor

  Grist is a flexible spreadsheet/database hybrid built by Grist Labs (New York City, US). France's ANCT and DINUM are major code contributors and deploy sovereign instances for public administration, but Grist Labs remains a US-headquartered, privately held company with no French ownership.

  United States

• grommunioSelf-hosted / open source

  Austrian open-source groupware and office suite as a Microsoft Exchange and Office alternative

  Austria

• Group-OfficeEU sovereign

  Dutch open-source groupware with email, calendar, file sharing, and CRM modules

  Netherlands

• HordeSelf-hosted / open source

  Open-source groupware framework providing webmail, calendar, and notes used by European providers

  United States

• LibreOfficeSelf-hosted / open source

  Free open-source office suite maintained by The Document Foundation in Germany

  Germany

• Nextcloud OfficeSelf-hosted / open source

  Integrated office suite within Nextcloud powered by Collabora Online for self-hosted collaboration

  Germany

• Open-XchangeEU sovereign

  German open-source email, calendar, and office platform used by major European ISPs

  Germany

• openDeskSelf-hosted / open source

  Sovereign German government-initiative office suite (ZenDiS), bundled from open-source components.

  Germany

• Tiki Wiki CMS GroupwareSelf-hosted / open source

  Open-source wiki-based groupware with built-in office and collaboration features

  France