W3avenue
Open atrium is an open source intranet package powered by drupal that is easy to install and use, and since it is open source you can customize it to meet your exact needs. open atrium’s built in features include a blog, a wiki, a calendar, a to do list, a shoutbox, and a dashboard to manage it all.
http://www.w3avenue.com/2009/07/16/open-atrium-open-source-intranet-package-powered-by-drupal
Developmentseed
Developmentseed
http://developmentseed.org/blog/2009/jun/17/announcing-open-atrium-open-source-intranet-package-powered-drupal
Intranetlounge
Intranets in many environments are still alive and well. regardless of the particular technologies you use within your business, there are plenty of open source and free intranet solutions out there with a plethora of features that developers can use or adapt to fulfil the needs of organisations without reinventing the wheel.
following on from an earlier review of content management system – i’ve decided to examine and review the featureset of each of the intranet solutions listed below, which hopeful...
http://intranetlounge.com/8-free-and-open-source-intranet-solutions-reviewed
Pfz
Open source intranet:
http://www.pfz.nl/forum/topic/6532-open-source-intranet
Precurio
Precurio
http://www.precurio.com
PHProject groupware
An open source groupware suite
http://www.phprojekt.com/
Alternet
Alternet
http://www.alternet.nl/zoeken/?tx_solr%5Bq%5D=open+source+intranet
TWIG groupware
TWIG groupware
http://twig.screwdriver.net/