PyMCA, the ESRF open source X-ray fluorescence analysis program has been published in Spectrochimica Acta Part B: Atomic Spectroscopy
The manuscript is available thru the following link:
PyMCA runs under PyQt and PyQt4 and profits from the GPLed version of Qt4.
Future releases may drop PyQt (Qt3) support.
Main developement continues with PyQt4 and PyQwt5.
First time Universal Mac Binaries available.