TrackStudio Enterprise Server Manager 4.09

TrackStudio is an ultra-configurable bug/issue tracking system and workflow engine that can be used to track the progress of any kind of task such as issue resolution, requirements gathering, desktop support handling, project monitoring, hardware deployment, staff hiring and document management.

Fully configurable workflows - any number of states and transitions means that you can create any number of workflows that mirror your business practices and that the application's use is only constrained by your imagination.
Hierarchical task tree - many tasks naturally comprise subtasks. TrackStudio allows any unlimited depth in the work breakdown structure (WBS) and can be configured to allow users to add and progress their own to-do items.
Read more and download it from here.