-IBM Lotus quickr (C/S, need License)
Introduction:
Https://slater.warwick.ac.uk/lotus/quickr! Ut/P/C0/tests! /
-Office Groove (C/S, P2P, need License)
Http://office.microsoft.com/en-us/groove/HA101656331033.aspx
-Collanos (P2P, freeware ).
Http://www.collanos.com/en/products/workplace/tour
In this kind of software, the share workspace is a good start. you can start a work with different people in different workspace. and it includes des some tools like discussion, IM and meeting. in this virtual office, you can do your work with other people, manage your events ENTs, arrange your schedule and align the team goal.
The collaboration software market grow faster and bigger. cause people have to and like to work together to complete a work than before. so P2P tech is very important for this kind of tool, cause most of middle companies won't buy new server (including hardware or software), they want to reduce non-core cost. they want to install the software and start to use not do much work on setup.
Actually it's a trend of SOA, the user don't care what you setup, they just want to use.