Projects may have for example
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Chat
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Communal To-Do lists:
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Issue tracker
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Action item tracker
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Meetings
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Tag vocabulary for tagging things. When you tag,. do it in a way that people in your project share the meaning of the tag.
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Sub-projects!
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Lists of resources they are using or have available -- human readable ones and/or technical resources like ontologies etc
Projects maybe at the high end also cover things like Companies and non-project organizations. At that end, maybe like schema:Project (which is too big for this, but would gave say departments)
At the low end, projects can be specific technical projects, like form-based user-generated apps creation. Projects could be be at github organizations or also at or repos level.