What software do you use for serial port monitoring?

I've been using Moni (www.rolf-schroedter.de/moni/) and have extended one of the included plugins using TCL. It has most of what I want, but TCL is proving to be a very... peculiar language.

Previously on 8052.com, Procomm and Tera Term were mentioned. I've used both of them, but found them both to suffer from the same problem; namely that they are primarily terminals which happen to be serial enabled as opposed to a serial port monitor which happen to have terminal command support. Also, the scripting support for both of these programs were quirky (didn't handle checksum routines well, only worked with decimal values, etc...) and exclusive to the application.

Ideally, a serial port monitor would have the following features:
1> Text view with ability to display control characters
2> Hex view with ascii view beside
3> Send mechanism with string, hex, octal, and binary input
4> Scripting support sending data and evaluating responses
5> Cross platform (preferably open source)

Know any programs that fit the bill?

--David