It would be nice to have a zammad developer documentation. I would love to learn how the back-end structure is, front-end designed, adding and using its API, etc…
I’m sure, having this would add a lot of contributors to this awesome project. We can take a look Discourse’s experience how important is having a lot of contributors, they created beginners guide called Discourse as Your First Rails App after a while the project was started. Now, take a look how many contributors they have and the project went so far.
They make money from it and the community got benefit from it.