msp4linux
C++ based debug interface to MSP430, MSP-FET430UIF needed
...The virtual tool chain itself consists of an implementation of the PC <> UIF transfer protocol and a public interface for a simulated target.
The screen shot demonstrates a simulated MSP430F5438A target on CCS (linux). As long as the CCS instance is not aware that there is no real hardware attached, it's a good test option for external simulators.