Useful debugging tools?

Hi all,

Me and a couple of friends have been developing a pc game in our spare time
for a while now.
We quickly realized the need for custom tools like level editor, debugging
tools, etc. so we spent some time in the beginning, developing these tools.

Having saved us a lot of time and grief, we thought that our debugging tool
might do the same for others, so we decided to make a more user friendly
version and make it available for download.
We have just finished the first version and put it up for download at:
www.geocities.com/proximainteractive

We're not sure of two things:
1. Is this kind of tool already available?
2. Do people find our tool useful?

- so I decided to create this post in hope of some feedback on these
questions.

Thank you,
B.J.