BlueFork
easy to use bugtracking software written in php and extjs
...Administrators are able to create Projects and unlimited milestones for their projects. The Administrator can also assign users to the project, which can create new tasks or reslove them. On each task the users can add multiple files, checklists, track their spend time, leave some notes or assign the ticket to another user in the project. Administrators can easily create new users, tasks, tasktypes, taskstates or user roles.