Microsoft Groove from Microsoft Office 2007 is the best in the game. It does require clients though and both users (or all users) must have a license.
I probably have some on-line collaboration software id somewhere. In the last few years lots of companies launched web-based services, and I've tried a lot. I had more than 1,000 passwords on my eWallet file and other day visited a few of those sites - almost 80% of those are now closed, since they all failed in one lesser important point: how to make money online to survive and keep providing the service.
I will be looking for some of these and post here later.
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