phpCollab

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http://www.php-collab.org/blog/

phpCollab is an open-source internet-enabled collaboration workspace for project teams. Modeled on Macromedia Sitespring, phpCollab architecture allows for the consulting team to share information with each other in one space and publish that information, when desired, to another space for the client. phpCollab encompasses the most important aspects of project management, such as task planning and document sharing, and hooks into other open source applications for bug tracking and content management, for ongoing project support. phpCollab's community, part of the larger sourceforge open source software community, is highly active and the dedicated volunteer team of developers, testers, and documenters is constantly enhancing the application to meet user needs.