Zentyal Server (formerly eBox Platform) is a commercial unified network server that offers easy and efficient computer network administration for small and medium-size businesses. It can act as a gateway, an infrastructure manager, a unified threat manager, an office server, a unified communication server or a combination of them. These functionalities are tightly integrated, automating most tasks, avoiding mistakes and saving time for system administrators. Zentyal is released under the GNU General Public License (GPL) and runs on top of Ubuntu.
Zentyal Server Development Edition

Zentyal Server Development Edition is aimed at organizations with in-house experience and skills to install, configure and maintain the Zentyal deployment by themselves.

Announcement: https://zentyal.com/news/zentyal-6-2-announcement/
Changelog: https://zentyal.com/news/zentyal-6-2-changelog/
Website: http://www.zentyal.org/
Distrowatch: https://distrowatch.com/table.php?distribution=zentyal