uForth has been mentioned here several times last year. It was my attempt at a very, very portable Forth (no dynamic memory allocation, ANSI C, bytecode generator for portable images, etc). It has been run successfully on MSP430s as well as Windows/Linux. No MSP430 code here unfortunately. I did most of the MSP430 code as part of my day job in 2010. It isn't mine to give away.
However, you can get a dump of the generic ANSI code here. I haven't touched it in months and it needs documentation (and some general lovin'). Unfortunately, I don't have access to MSP430s anymore and so that is left as an exercise for the reader :-(