PLOTS smartphone spectrometer
In progress design -- pictured is the paper prototype, but I don't know enough about 3d printing to get it to come out right:
http://publiclaboratory.org/notes/warren/7-17-2012/failed-3d-print-mobile-spectrometer-attachment
http://publiclaboratory.org/notes/warren/6-12-2012/mobile-android-version-spectral-workbench
Software: http://spectralworkbench.org/
This design is released under the CERN Open Hardware License 1.1