The massXpert software package is a mass spectrometry environment for linear (bio-)polymers. It inherits all the innovations of GNU polyxmass. It allows the detailed definition of new polymer chemistries in the XpertDef module. These chemistry definitions are then used in the desktop calculator-like mass calculator (XpertCalc) and in the sophisticated polymer sequence editor and (bio-)chemical/mass spectrometric simulations module (XpertEdit). Available simulations include polymer and monomer chemical modifications, polymer sequence cleavage, gas-phase fragmentation, m/z ratio calculations, and more. License: GNU General Public License (GPL) Changes: There is finally one Mac OS X package. The whole software program is now relocatable. The French translation is 100% complete. A lot of code cleanup work has been done, along with an implementation of namespaces in the whole project. Some classes have been added and some existing classes redesigned. There are bugfixes here and there, and the documentation has been updated.

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