Reliable terminal emulation in the modern age?

[Bob Sutterfield]

xterm(1) does a good job, and its termcap(6) entry is accurate.  If you
run xterm on the destination machine, with its $DISPLAY bringing the UI
back to your desktop, I haven't found anything yet that breaks.  Or you
can run xterm locally and ssh to the destination - works fine too.

If you want to run a local window and connect out through your serial
port, I have always found Kermit to async handle flow and modem control
as faithfully as they can be managed.