Infrastructure Tools

What sort of tools have people found useful for supporting their FDD projects?

In any non-trivial project, a great deal of infrastructure is required to support the development effort. There are the usual tools, like version control, bug tracking, etc.

I imagine most projects reinvent a few wheels along the way. One central theme of FDD is taking what works and leveraging it, within and across projects.

So what tools have people found useful? Are they internal only, or is there the possibility of sharing them? Another idea that just occured to me: it would be brilliant to have a collection of open source tools that the community could share and improve.