check out hipergate (Score 1)

You might check into www.hipergate.org. They have some CMS stuff as well as a variety of features. I think they are focused more on a diverse set of tools as opposed to concentrating on the specifics of a single area. How did they put it .. something like trying to be more horizontal than vertical. It has been awhile since I checked into them myself, so my comments could be a little dated.