How do I list forwarded open connections?

[Cuardin]

I used to have an openBSD firewall and there I could use netstat with a switch to see the state of the firewall, specifically which connections were open through the firewall to and from my internal computers. I have been looking for something similar in linux but so far not come up with anything. The GNU/linux netstat seems to not have that feature.
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[Cuardin]

And in formulating the letter I came to realize that of course I would find the infor in a file under /proc, and of course the info is all there in /proc/net/ip_conntrak
But it is 3 screenfulls of compact text.

So the question remains in a slightly modified form:
Is there a tool that gives the info it to me in a marginally readable format?
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Part of "The adopt an unanswered post initiative"