I need a Project management tool that works in Linux, and has Gantt charts.

1. It doesn't have to be free, just not expensive.
2. I don't care how it stores the information I give it, as long as I can access it.
3. I must be able to **print** the Gantt charts.
4. Must work in Linux.

With those requirements, what can you recommend?

TheObserver asked a windows specific version of this question [here](https://stackoverflow.com/questions/151787/recommended-chartingreportingdashboard-tool). 

Thanks for the help everyone.