It's like HyperTerminal, but not shitty and annoying!
Written in Java for JRE 6. This depends on JavaComm 2.0, which is no longer available direct from Sun although it's archived in several places. It may work with the current JavaComm (3.0), but this is only available for Linux and Solaris. If someone wants to global-replace “javax.comm” with “gnu.io”, it'll probably work with RxTx as well.
Changelog
2.0 (26 Feb 2009): Fixed the printing-one-character-every-two bug, Added ability to send.
1.0 (21 Aug 2008): Initial release.
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Executable (CrapTerminal.jar)
Source Code (CrapTerminal.java)