This is the common software analysis package of the Forward and Small-x QCD group in the CMS experiment at CERN to process LHC Run2 data.
For more information regarding this framework, please look at the following pages:
https://twiki.cern.ch/twiki/bin/viewauth/CMS/FSQCommonFW
https://twiki.cern.ch/twiki/bin/viewauth/CMS/FSQCommonFWTutorialP2 (currently not up to date)
Twiki page with existing skims:
https://twiki.cern.ch/twiki/bin/view/CMS/CFFSkims
Special tutorial session on how to work with python analyzers:
https://twiki.cern.ch/twiki/bin/view/CMS/FSQCommonFW201504Jets
Or look into the /Core/doc directory for information.
Please note that this is still in heavy development...