The new version of Zimbra just got out but his API documentation has finally been release today.

Some time ago, I’ve taken care to bring the documentation in docset format for Dash and Zeal.

So from now on, you can find the SOAP and Zimlet documentation for 8.7 directly in the “User Contributed” section in Dash:

And follow the how-to in the github project for Zeal.
Besides not having Windows / Linux with GUI, if a charitable soul could test Zeal and confirm that it works it would be nice.