...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 and place intrapages.ntf in your IBM Notes data directory
2. Create a new application based on the template and add it to your Domino server
3. ...