tmux is a "terminal multiplexer". It allows a
number of terminals (or windows) to be accessed
and controlled from a single terminal. It is
intended to be a simple, modern, BSD-licensed
alternative to programs such as GNU screen.
Hanterm is an xterm improvement for Hangul (Korean Language) support. Its features include support for johab* encoded fonts, UTF-8 encoding for output, in addition to usual wansung (KSC-5601/KSX-1001) encoded fonts.