I started this Add-on two years ago It is in use, and there is only little code .
The code is here
I would like to refactor the code, so I look out for someone with JavaScript experience. Also, there are some improvements, which I would like to discuss.
In the long run, it would be good to not being alone on this Add-on.
A user approached me to add Cardbook support. I think this is a good idea.
My primary interest is to find a collaborator or co-maintainer.