Using Linux/SuSE at the Desktop--Telnet or X?

Dear SuSE Wizards, I have sold an application for years that has a *nix backend but traditionally terminals or PC with terminal emulators running Telnet clients at the front end. What do I use if I want to run Linux at the Desktop with Linux at the Server? Basically, I think I'm looking for a Telnet Client like what is offered by the James River Group but not for windoze but for Linux. Any ideas? Is there something already in there that does a nice job? (I am familiar with Putty and it is decent, but I'm looking for a few more bells and whistles so that it might even be GUI. TIA -- Andrew Lietzow The ACL Group, Inc.