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Streber is a free wiki driven project management tool written in php5. Freelancers and small teams can easily setup projects and keep track of tasks, issues, bugs, efforts etc. Project-User-Rights can be adjusted e.g. to provide clients a limited view of the current project state.
It supports very easy Installation with FTP.

http://www.streber-pm.org/

dotProject is a volunteer supported Project Management application. There is no "company" behind this project, it is managed, maintained, developed and supported by a volunteer group and by the users themselves.
http://www.dotproject.net/