[sevensven]

You'll probably like http://www.redmine.org/

From the website: Overview

    * Multiple projects support
    * Flexible role based access control
    * Flexible issue tracking system
    * Gantt chart and calendar
    * News, documents & files management
    * Feeds & email notifications
    * Per project wiki
    * Per project forums
    * Time tracking
    * Custom fields for issues, time-entries, projects and users
    * SCM integration (SVN, CVS, Git, Mercurial, Bazaar and Darcs)
    * Issue creation via email
    * Multiple LDAP authentication support
    * User self-registration support
    * Multilanguage support
    * Multiple databases support

[smoyer]

I started using Redmine at the beginning of my latest startup (March 2010) and love it!