Zammad offers a 30-day free trial for our hosted service. You can use this service without any commitment in the professional-version. This is the most common service we offer.
I case you want to test Zammad with all functionalities, we can upgrade your trial instance to the plan "Plus". Simply send a short email incl. your instance-url.
There is no free trial for our self-hosted support contracts.
This product can be downloaded for free, since it is still Open Source of course.