diff --git a/README.md b/README.md
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+++ b/README.md
@@ -1000,6 +1000,7 @@ Games, game servers and control panels.
 - [Citadel](https://www.citadel.org/doku.php) - Groupware including email, calendar/scheduling, address books, forums, mailing lists, IM, wiki and blog engines, RSS aggregation and more. ([Source Code](https://www.citadel.org/source.html)) `GPL-3.0` `C`
 - [Corteza](https://cortezaproject.org) - CRM including a unified workspace, enterprise messaging and a low code environment for rapidly and securely delivering records-based management solutions. ([Demo](https://latest.cortezaproject.org), [Source Code](https://github.com/cortezaproject/corteza-server)) `Apache-2.0` `Go`
 - [Cozy Cloud](https://cozy.io) - Personal cloud where you can manage and sync your contact, files and calendars, and manage your budget with an app store full of community contributions. ([Source Code](https://github.com/cozy)) `GPL-3.0` `Nodejs`
+- [Group Office](https://www.group-office.com) - Group-Office is an enterprise CRM and groupware tool. Share projects, calendars, files and e-mail online with co-workers and clients. ([Source Code](https://github.com/Intermesh/groupoffice/)) `AGPL-3.0` `PHP`
 - [egroupware](https://www.egroupware.org/) - Software suite including calendars, address books, notepad, project management tools, client relationship management tools (CRM), knowledge management tools, a wiki and a CMS. ([Source Code](https://github.com/EGroupware/egroupware)) `GPL-2.0` `PHP`
 - [EspoCRM](https://www.espocrm.com/) - CRM with a frontend designed as a single page application, and a REST API. ([Demo](https://demo.espocrm.com/), [Source Code](https://github.com/espocrm/espocrm)) `GPL-3.0` `PHP`
 - [Horde](https://www.horde.org/) - The Horde Project is about creating high quality Open Source applications and libraries, based on PHP and the Horde Framework. ([Demo](http://demo.horde.org/login.php), [Source Code](https://github.com/horde/horde)) `GPL-2.0` `PHP`