Project.net is the next generation project portfolio management solution: a fully-featured open source alternative that stands apart from other proprietary, expensive-to-license packages:
Maximizing Collaboration:
Project.net unifies blogs and wikis naturally into the project management workflow, maximizing collaboration between team members. The resulting content-rich project record provides project managers, the project management office (PMO) and executive staff the extended information needed for both effective day-to-day project tracking and high-level strategic decisions.

Online Help Link-
http://faq-beta.project.net/

Open Source:
Traditional project portfolio management packages demand high-priced, up-front licensing fees; to add insult to injury, there`s additional costs for ongoing licensing fees, deployment, configuration, and training. Project.net`s open source so you can fully leverage any in-house expertise you may already have, supplementing it with Project.net`s professional services as needed.

Enterprise-grade project portfolio management solution:

Project.net is feature complete, providing all of the check-off functionality you expect in a enterprise-grade project portfolio management solution. As an open source project, Project.net leverages wide adoption and community engagement to offer a dynamic project portfolio management platform that`s both robust and innovative