Vosao CMS works with the Google app. I have not tried Plone CMS. But Vosao CMS has all the features you are looking for.
he has version control, workflow, WYSIWYG editing, design templates. Not sure about your fourth point. I'm not sure what you mean by saying:
Content objects that have a "strong typing" - Plone allows you to create (in a programming language) content "classes" whose relationships with other instances of content types are limited by type. Thus, for an instance, I can create an article type that has an event link, and the user interface ensures that I can create articles and links only event objects for the event field of my article objects. (Creating these "classes" may be the task of the developer or hiding behind the admin UI)
check this google codepage for vasao CMS
Also see this vasao CMS FAQ page
For more help check the vasao cms website
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