ProjectPier is a Free, Open-Source, self-hosted PHP application for managing tasks, projects and teams through an intuitive web interface. ProjectPier will help your organization communicate, collaborate and get things done Its function is similar to commercial groupware/project management products, but allows the freedom and scalability of self-hosting
Web-Powered: PP is completely web based
Easy: PP is focused on simple concepts and usability to provide an easy to use solution
Organized: PP organizes your projects into Milestones, Messages, Tasklists, Tasks and Files.
Everywhere: E-mail notifications for new milestones, tasks, messages and comments mean that your users can stay in the loop without checking the site.
Free and Open: ProjectPier is open source and Free Software, and will always be free as in speech and as in beer (Honest Public Licence, modified GPL)
No Restrictions: PP allows an unlimited number of Projects, Clients, Users, and every other object. ProjectPier wants to help you get things done, not get in the way.