We just published our new open source ticketing and customer service system.

Commercial page: https://zammad.com/ Source: https://github.com/zammad/zammad Org page: https://zammad.org/ Foundation page: http://zammad-foundation.org/

Background: The founder and creator of the OTRS ticket system build an open source Zendesk alternative with some pretty neat features which can be found here: http://days.zammad.org/

Can't wait to read your feedback and what you think.