Massign is a software package designed to deconvolute and analyse mass spectra - aimed especially at non covalent complexes. Details about the software and the corresponding assignment strategy are published and can be found here:
Nina Morgner and Carol V. Robinson,   Anal. Chem., 2012, 84 (6), pp 2939–2948
Massign: An Assignment Strategy for Maximizing Information from the Mass Spectra of Heterogeneous Protein Assemblies

You can now find the current version of Massign for download, as well as some tutorials on how to use it.
The tutorials don't cover the full range of possibilities yet, but cover the basics - I will add to them, so please check back here occasionally.  
If you have any questions please email me at morgner (at)  
or  nina.morgner (at)  (please note that this email adress will stop working on the 16th sep 2013)

ign is available free of charge to academic non-profit institutions; you will, however, need to sign a licence (and receive a password) in order to download and use the software.

The Massign programs are written with LabVIEW. In order to run the Massign executables you'll have to install the LabVIEW 2010 Run-Time Engine (Standard) (64-bit), which can be downloaded for free from the National instruments website

Here is explained how to install a runtime engine