I really like napsaterm that comes with AmiTCP. I'm not sure but it might be included in
AmiTCP 3.0b that is available to download for free.
*edit*
Just checked, it's on
AmiNet atleast.
NapsaTerm doesn't do color, but it's very speedy, especially noticable on AGA machines. And it's the only telnet client I have found that works with most everything (CenterICQ, {bleep}X ...)