Without a doubt qdPM is one of the best project management scripts.
qdPM is an open source and Free Web-Based Project Management Software (PHP/MySql) The best thing is basically the flexibility of adding statuses, phases, extra fields everywhere! Small changes would be great, but that are really small things. One of them is a remember-me-function. Would like to see sessions/cookies, since there is no such function for logged in users and logging in several times a day is not that fun. Installation is easy, and more easy then the manual gives impression of.
Visit publisher site: http://qdpm.net