Here is a list of all namespaces with brief descriptions:

[detail level 12345]

B0ToKstarMuMu_14TeV_TuneCP5_cfi
b2gDoubleLeptonHLTEventValidation_cfi
B2GDQM_cfi
b2gHadronicHLTEventValidation_cfi
b2gHLTValidation_cff
b2gHLTValidationHarvest_cff
B2GMonitoring_cff
B2GMonitoring_Client_cff
b2gSingleLeptonHLTEventValidation_cfi
B2GTnPMonitor_cfi
BadChargedCandidateFilter_cfi
BadChargedCandidateSummer16Filter_cfi
badGlobalMuonTaggerFWLite
badGlobalMuonTaggersAOD_cff
badGlobalMuonTaggersMiniAOD_cff
BadPFMuonDzFilter_cfi
BadPFMuonSummer16Filter_cfi
bareGlobalTrackingGeometry_cfi
barrelUtil
base_cff
BasicGenParticleValidation_cfi
BasicGenValidation_cff
BasicHepMCHeavyIonValidation_cfi
BasicHepMCValidation_cff
BasicHepMCValidation_cfi
batchHippy
batchmanager
BCToEFilter_cfi
BDHadronTrackMonitoring_cfi
BDHadronTrackValidation_cff
BdToKstarEleEle_14TeV_TuneCP5_cfi
BdToMuMu_13TeV_SoftQCDnonD_TuneCUEP8M1_cfi
BdToMuMu_forSTEAM_13TeV_cfi
beam_dqm_sourceclient-live_cfg
BeamBkgSkim_cff
BeamConditionsMonitor_cff
beamerCreator
beamfake_dqm_sourceclient-live_cfg
BeamHalo_13TeV_cfi
BeamHalo_cfi
BeamHaloAnalyzer_cfi
BeamHaloMinus_cfi
BeamHaloNavigationSchoolESProducer_cfi
BeamHaloPlus_cfi
BeamHaloPropagator_cff
BeamHaloPropagatorAlong_cfi
BeamHaloPropagatorAny_cfi
BeamHaloPropagatorOpposite_cfi
BeamHaloSummary_cfi
beamhlt_dqm_sourceclient-live_cfg
beamhltfake_dqm_sourceclient-live_cfg
BeamMonitor_cff
BeamMonitor_Cosmics_cff
BeamMonitor_MC_cff
BeamMonitor_Pixel_cff
BeamMonitor_PixelLess_cff
BeamMonitorBx_cff
beampixel_dqm_sourceclient-live_cfg
BeamSplash_cfg
beamspot
BeamSpot_cff
BeamSpot_cfi
BeamSpot_EventContent_cff
beamspotanalyzer_cfi
beamspotdip_dqm_sourceclient-live_cfg
BeamSpotDipServer_cff
BeamSpotEarly10TeVCollision_cff
BeamSpotEarly10TeVCollision_cfi
BeamSpotEarly10TeVCollision_DevDB_cff
BeamSpotEarly10TeVCollision_IntDB_cff
BeamSpotEarlyCollision_cff
BeamSpotEarlyCollision_cfi
BeamSpotEarlyCollision_DevDB_cff
BeamSpotEarlyCollision_IntDB_cff
BeamSpotFakeConditionsEarly10TeVCollision_cff
BeamSpotFakeConditionsEarly10TeVCollision_cfi
BeamSpotFakeConditionsEarlyCollision_cff
BeamSpotFakeConditionsEarlyCollision_cfi
BeamSpotFakeConditionsNominalCollision_cff
BeamSpotFakeConditionsNominalCollision_cfi
BeamSpotFakeConditionsSimpleGaussian_cff
BeamSpotFakeConditionsSimpleGaussian_cfi
BeamSpotFakeParameters_cfi
BeamSpotFilterParameters_cfi
BeamSpotNominalCollision1_cff
BeamSpotNominalCollision1_cfi
BeamSpotNominalCollision2_cff
BeamSpotNominalCollision2_cfi
BeamSpotNominalCollision3_cff
BeamSpotNominalCollision3_cfi
BeamSpotNominalCollision4_cff
BeamSpotNominalCollision4_cfi
BeamSpotNominalCollision_cff
BeamSpotNominalCollision_cfi
BeamSpotNominalCollision_DevDB_cff
BeamSpotNominalCollision_IntDB_cff
BeamSpotObj
BeamSpotOnline_cff
BeamSpotOnline_cfi
BeamSpotOnlineAnalyzerStartRun
BeamSpotOnlineObjectsImpl
BeamSpotPI
BeamSpotProblemMonitor_cff
BeamSpotRcdRead_cfi
BeamSpotSimpleGaussian_cff
BeamSpotSimpleGaussian_cfi
BeamSpotSimpleGaussian_DevDB_cff
BeamSpotSimpleGaussian_IntDB_cff
BeamSpotWorkflow
beamvalidation
BeautifulSoup
BeTarget_cfi
betterConfigParser
bhmGeometry_cfi
bhmSimGeometryXML_cff
bhmSimGeometryXML_cfi
bigModule
bigStructure
bitset_utilities	This file contains additional dynamic_bitset methods
bJetOperatingPointsParameters_cfi
BJets_Pt_50_120_cfi
bJpsiMuMuTrigSettings_cff
bJpsiX_8TeV_TuneCUETP8M1_cfi
bJpsiX_cfi
bJpsiX_EXTRAS_cff
bJpsiX_filt_cfi
bk
blacklist
bmtfDigis_cfi
bmtfStage2Raw_cfi
bookConverter
boost
archive
serialization
spirit
classic
boostedElectronIsolation_cff
boostedHPSPFTaus_cff
boostedHPSPFTaus_cfi
boostedMuonIsolation_cff
boostedTaus_cff
boostrapWithFamos_cff
BPHMonitor_cff
BPHMonitor_cfi
BPHMonitoring_Client_cff
BPhysicsMonitoring_cff
BPhysicsMonitoring_Client_cff
bphysicsOniaDQM_cfi
BPhysicsValidation_cfi
BrassGeom_cfi
bril_dqm_clientPB-live_cfg
brokenline
bsc_activity_cfg
bscnobeamhalo_cfg
bscTrigger_cfi
BsMM_cfi
BsMM_EXTRAS_cff
BsMM_filt_cfi
BSPrintUtils
bspvanalyzer_cfi
BsToEleEle_14TeV_TuneCP5_cfi
BsToJpsiGamma_14TeV_TuneCP5_cfi
BsToJpsiPhi_13TeV_SoftQCDnonD_TuneCUEP8M1_cfi
BsToJpsiPhi_mumuKK_14TeV_TuneCP5_cfi
BsToMuMu_13TeV_SoftQCDnonD_TuneCUEP8M1_cfi
BsToMuMu_14TeV_TuneCP5_cfi
BsToMuMu_forSTEAM_13TeV_cfi
BsToMuMu_forSTEAM_13TeV_ExtGen_cfi
BsToPhiPhi_KKKK_14TeV_TuneCP5_cfi
btag
Btag_btag110711
Btag_btagMistag0612
Btag_btagMistagAB
Btag_btagMistagABCD
Btag_btagMistagC
Btag_btagMistagD
Btag_btagMistagWinter13
Btag_btagMuJetsWp
Btag_btagMuJetsWp0612
Btag_btagMuJetsWpNoTtbar
Btag_btagMuJetsWpTtbar
Btag_btagTtbarDiscrim
Btag_btagTtbarDiscrim0612
Btag_btagTtbarDiscrimWinter13
Btag_btagTtbarMc0612
Btag_btagTtbarWp
Btag_btagTtbarWp0612
Btag_btagTtbarWpWinter13
Btag_calo33
Btag_calo35
Btag_calo36
Btag_mistag101101
Btag_mistag101220
Btag_mistag110118
Btag_mistag110711
Btag_MISTAGSSVHEM
Btag_pf35
Btag_pf36
bTagAnalysis_cfi
bTagAnalysis_firststep_cfi
bTagAnalysis_harvesting_cfi
bTagAnalysisData_cfi
btagbtvdeep
btagCalib_EventContent_cff
btagCalib_OutputModule_cff
btagCalib_SkimPaths_cff
bTagCalibrationDbCreation
bTagCommon_cff
btagDijet_cfi
btagDijet_EventContent_cff
btagDijet_HLT_cfi
btagDijet_OutputModule_cff
btagDijet_SkimPaths_cff
btagDijetOutputModuleAODSIM_cfi
btagDijetOutputModuleRECOSIM_cfi
btagElecInJet_cfi
btagElecInJet_EventContent_cff
btagElecInJet_HLT_cfi
btagElecInJet_OutputModule_cff
btagElecInJet_SkimPaths_cff
btagElecInJetOutputModuleAODSIM_cfi
btagElecInJetOutputModuleRECOSIM_cfi
btagGenBb_cfi
btagGenBb_EventContent_cff
btagGenBb_OutputModule_cff
btagGenBb_SkimPaths_cff
btagGenBbOutputModuleAODSIM_cfi
btagGenBbOutputModuleRECOSIM_cfi
bTagGenericAnalysis_cff
bTagging_cff
BTaggingMonitor_cfi
BTaggingMonitoring_cff
BTaggingMonitoring_Client_cff
btagMC_QCD_120_170_cfi
btagMC_QCD_120_170_EventContent_cff
btagMC_QCD_120_170_SkimPaths_cff
btagMC_QCD_120_170OutputModule_cfi
btagMC_QCD_200_300_cfi
btagMC_QCD_200_300_EventContent_cff
btagMC_QCD_200_300_SkimPaths_cff
btagMC_QCD_200_300OutputModule_cfi
btagMC_QCD_20_50_cfi
btagMC_QCD_20_50_EventContent_cff
btagMC_QCD_20_50_SkimPaths_cff
btagMC_QCD_20_50OutputModule_cfi
btagMC_QCD_380_470_cfi
btagMC_QCD_380_470_EventContent_cff
btagMC_QCD_380_470_SkimPaths_cff
btagMC_QCD_380_470OutputModule_cfi
btagMC_QCD_50_80_cfi
btagMC_QCD_50_80_EventContent_cff
btagMC_QCD_50_80_SkimPaths_cff
btagMC_QCD_50_80OutputModule_cfi
btagMC_QCD_800_1000_cfi
btagMC_QCD_800_1000_EventContent_cff
btagMC_QCD_800_1000_SkimPaths_cff
btagMC_QCD_800_1000OutputModule_cfi
btagMC_QCD_80_120_cfi
btagMC_QCD_80_120_EventContent_cff
btagMC_QCD_80_120_SkimPaths_cff
btagMC_QCD_80_120OutputModule_cfi
btagMC_ttbar_cfi
btagMC_ttbar_EventContent_cff
btagMC_ttbar_SkimPaths_cff
btagMC_ttbarOutputModule_cfi
bTagMiniDQM_cff
bTagMiniDQMDeepCSV
bTagMiniDQMDeepFlavour
btagMuonInJet_cfi
btagMuonInJet_EventContent_cff
btagMuonInJet_HLT_cfi
btagMuonInJet_OutputModule_cff
btagMuonInJet_SkimPaths_cff
btagMuonInJetOutputModuleAODSIM_cfi
btagMuonInJetOutputModuleRECOSIM_cfi
BTagPerformanceDB062012
BTagPerformanceDB100426
BTagPerformanceDB1011
BTagPerformanceDB1012
BTagPerformanceDB1101
BTagPerformanceDB1107
BTagPerformanceDB2013
BTagPerformanceDBMC33X
BTagPerformanceDBMC35X
BTagPerformanceDBMC36X
BTagPerformanceDBOctEx
BTagPerformanceDBWinter13
BtagPerformanceESProducer_cfi
BtagPerformanceFragment
BTagSF
bTagTrackIPAnalysis_cff
bTagTrackProbabilityAnalysis_cff
BTagWeightCalculator
btagWeightTable_cff
btau_dummy
btlDigiHits_cfi
bToCharmDecayVertexMerger_cfi
BTVHLTOfflineSource_cfi
btvTracks_cfi
builder_last_value_cfg
builder_status_change_cfg
buildHistoTypes
BulkG_M1200_narrow_2L2Q_LHE_13TeV_cff
BuMixing_BMuonFilter_forSTEAM_13TeV_TuneCUETP8M1_cfi
BuMixing_BMuonFilter_forSTEAM_14TeV_TuneCP5_cfi
BuMixing_forSTEAM_13TeV_TuneCUETP8M1_cfi
bunchSpacingProducer_cfi
BuToJpsiK_13TeV_SoftQCDnonD_TuneCUEP8M1_cfi
BuToJPsiPrimeKToJPsiPiPiK_14TeV_TuneCP5_pythia8_cfi
BuToKstarJPsiToMuMu_forSTEAM_13TeV_cfi
BuToKstarJPsiToMuMu_forSTEAM_13TeV_ExtGen_cfi
BuToKstarMuMu_forSTEAM_13TeV_TuneCUETP8M1_cfi
BuToKstarPsi2S_forSTEAM_13TeV_TuneCUETP8M1_cfi
bVertexFilter_cfi
BwdAnalyticalPropagator_cfi
BwdElectronPropagator_cfi
bwdGsfElectronPropagator_cff
BXlumiParameters_cfi
BxTiming_cfi
byclustsummsipixelmulteventfilter_cfi
byclustsummsipixelvssistripmulteventfilter_cfi
byclustsummsistripmulteventfilter_cfi
bysipixelclustmulteventfilter_cfi
bysipixelvssistripclustmulteventfilter_cfi
bysistripclustmulteventfilter_cfi
bysistripdigitmulteventfilter_cfi