Hi
A list is available here:
http://www.dmine.com/telnet/And you should be able to find quite a few Amiga ones in there
And as for nethack - that has to be one of the best games ever! There's even a 3d version, called the Eagle's eye or something (which I didn't like at all) and there's a graphical version too (which is good). I still prefer the ASCII feel though.
And at this point, someone chips in with, "But ADOM's better!"
[or at least that's what one of my mates says when I mention Nethack]