Znuny is our first choice open source ticketing system and an integral part of the ITSM Suite of it-novum .

openITCOCKPIT provides a two-way integration for Znuny.

By changing the ticket state to “In progress” an acknowledgement will be set in openITCOCKPIT and vice versa.

https://github.com/znuny/Znuny