Web-like Graph? Or something similar

[[V]]

Here is my scenario:
I have a bunch of data points, each of which shares homology with another.

Basically
A -> B
A ->D
B -> C
C -> A .:. C ->D, etc...

given a bunch of these relations, I need someway to graphically represent these relationships. I picture this somehow with a "web" like graph.

Does anything like this exist?

Thanks

[pyTony]

If you are running under Linux, you can use:
http://www.daniweb.com/software-development/python/code/323792

This looks also promising: http://pywebgraph.sourceforge.net/