wXMPI is a port of XMPI to the wxWindows API.
First, some background info:
MPI (Message Passing Interface) is a standard for parallel computing: http://www.mpi-forum.org/
LAM is a GPL implementation of MPI: http://www.lam-mpi.org/
XMPI is an X/Motif based graphical user interface for running, debugging and visualizing MPI programs using LAM: http://www.lam-mpi.org/software/xmpi/
wxWindows is an open-source multiplatform GUI Toolkit and API, similar to Qt: http://www.wxwindows.org/
So, now I hope you understand me when I say: wXMPI is a port of XMPI to the wxWindows toolkit.
The main reason was to have a native GUI look and feel under MacOSX, so that XWindows wasn't needed.
You need to compile it yourself. For details, check the installation page. In short, you'll need LAM, XMPI and wxWindows.
Right now it is in Alpha stage. Not all the parts are working, and the some that work have bugs. However, it compiles and runs.
Please contact me if you'd like to contribute: paulotex at yahoo dot com.
The development started under MacOSX 10.2, but I hope it is POSIX.
GNU GPL: http://www.gnu.org/licenses/gpl.html
paulotex at yahoo dot com