Readd Horde and update source

README.md

@@ -1083,6 +1083,7 @@ Collaborative software or [groupware](https://en.wikipedia.org/wiki/Collaborativ
 - [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`
 - [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`
+- [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/base)) `GPL-2.0` `PHP`
 - [HRCloud2](https://github.com/zelon88/HRCloud2) - Full-featured home hosted Cloud Drive, Personal Assistant, App Launcher, File Converter, Streamer, Share Tool and more. `GPL-3.0` `PHP`
 - [Kolab](https://kolab.org/) - Kolab community is a unified communication and collaboration system. ([Source Code](https://git.kolab.org/)) `GPL-2.0/LGPL-2.1/GPL-3.0` `C++/Python/PHP`
 - [Kopano](https://kopano.com/) - Groupware suite including e-mail, calendars, tasks, todos and notes. Featuring a modern WebApp, DeskApp and mobile access over Z-Push/ActiveSync. ([Demo](https://demo.kopano.com), [Source Code](https://stash.kopano.io)) `AGPL-3.0` `C/Python/PHP`