Intrapages is a social intranet based on IBM Domino.
You can setup multiple instances with different content and different users.
Login support Facebook, Twitter, Linkedin, Domino, Site Registration and Active Directory. which allows you to have users from both your intranet and internet in the same application
live community is available here
http://www.intrapages.com
Also have a look at the project page at openNTF
http://intrapages.openntf.org
Easy install
1. Download the zip file...