Here are the classes, structs, unions and interfaces with brief descriptions:

[detail level 1234567]

QCD_GenJets_cfi
QCD_Pt-15To7000_TuneCUETP8M1_Flat_14TeV-pythia8_cff
QCD_Pt-20toInf_MuEnrichedPt15_TuneCUETP8M1_13TeV_pythia8_cff
QCD_Pt-20toInf_MuEnrichedPt15_TuneCUETP8M1_14TeV_pythia8_cff
QCD_Pt15To7000_Flat_14TeV_TuneCP5_cff
QCD_Pt20toInf_MuEnrichedPt15_14TeV_TuneCP5_cff
QCD_Pt_120_170_13TeV_TuneCUETP8M1_cfi
QCD_Pt_120_170_8TeV_TuneCUETP8M1_cfi
QCD_Pt_120_170_cfi
QCD_Pt_15_20_8TeV_TuneCUETP8M1_cfi
QCD_Pt_15_20_cfi
QCD_Pt_170_230_8TeV_TuneCUETP8M1_cfi
QCD_Pt_170_230_cfi
QCD_Pt_1800_2400_13TeV_TuneCP5_cfi
QCD_Pt_1800_2400_14TeV_TuneCP5_cfi
QCD_Pt_20_30_8TeV_TuneCUETP8M1_cfi
QCD_Pt_20_30_cfi
QCD_Pt_3000_3500_13TeV_TuneCUETP8M1_cfi
QCD_Pt_3000_3500_14TeV_TuneCUETP8M1_cfi
QCD_Pt_3000_3500_8TeV_TuneCUETP8M1_cfi
QCD_Pt_3000_3500_cfi
QCD_Pt_30_13TeV_herwigpp_cff
QCD_Pt_30_13TeV_pythia8_cff
QCD_Pt_30_50_13TeV_TuneCUETP8M1_cfi
QCD_Pt_30_50_8TeV_TuneCUETP8M1_cfi
QCD_Pt_30_50_cfi
QCD_Pt_30_80_BCtoE_8TeV_TuneCUETP8M1_cfi
QCD_Pt_30_TuneZ2star_13TeV_pythia6_cff
QCD_Pt_50_80_8TeV_TuneCUETP8M1_cfi
QCD_Pt_50_80_cfi
QCD_Pt_600_800_13TeV_TuneCUETP8M1_cfi
QCD_Pt_600_800_14TeV_TuneCUETP8M1_cfi
QCD_Pt_600_800_8TeV_TuneCUETP8M1_cfi
QCD_Pt_80_120_13TeV_TuneCUETP8M1_cfi
QCD_Pt_80_120_14TeV_TuneCP5_cfi
QCD_Pt_80_120_14TeV_TuneCUETP8M1_cfi
QCD_Pt_80_120_8TeV_TuneCUETP8M1_cfi
QCD_Pt_80_120_cfi
QCD_Pt_80_170_BCtoE_8TeV_TuneCUETP8M1_cfi
QCDForPF_13TeV_TuneCUETP8M1_cfi
QCDForPF_14TeV_TuneCP5_cfi
QCDForPF_14TeV_TuneCUETP8M1_cfi
QCDForPF_8TeV_TuneCUETP8M1_cfi
QCDForPF_cfi
QCDgen_cfi
qcdHighPtDQM_cfi
qcdLowPtDQM_cfi
qcdPhotonsCosmicDQM_cff
qcdPhotonsDQM_cfi
qcdUeDQM_cfi
qglESProducer_cfi
QGLikelihoodCalculator
QGLikelihoodCalculator
QGTagger_cfi
QIE10HeaderSpec
QIE10Task
QIE11HeaderSpec0
QIE11HeaderSpec3
QIE11Task
QIE8HeaderSpec
QIE8SampleSpec
qjetsadder_cfi
qlpd
Cache
QQH120Inv_8TeV_TuneCUETP8M1_cfi
QQH120Inv_cfi
QQH1352T_13TeV_TuneCUETP8M1_cfi
QQH1352T_8TeV_TuneCUETP8M1_cfi
QQH1352T_cfi
QQH1352T_Tauola_13TeV_TuneCUETP8M1_cfi
QQH1352T_Tauola_14TeV_TuneCUETP8M1_cfi
QQH1352T_Tauola_cfi
QQToHToTauTau_mh125_TuneCP5_14TeV_pythia8_cfi
QuadReReco_cff
QuarkoniaTrackSelector_cfi
query
DDOptionParser
querying
connection
factory
querying_tests
global_tag_map_tests
iov_tests
misc_tests
payload_tests
querying_tests
result_type_tests
tag_tests
queryRR
quickTrackAssociatorByHits_cfi
QBBCCMS
QcdHighPtDQM
QcdLowPtDQM
Pixel
Tracklet
Vertex
QcdPhotonsDQM
QcdUeDQM
QCriterion
QGLikelihoodCalculator
QGLikelihoodCategory	Category structure: ranges associated with QGLikelihood histograms
QGLikelihoodDBReader
QGLikelihoodDBWriter
QGLikelihoodESProducer
QGLikelihoodObject	QGLikelihoodObject containing valid range and entries with category and histogram (mean is not used anymore, only for backward backward compatibility with older DB constructs)
Entry
QGLikelihoodParameters	Parameters structure
QGLikelihoodRcd
QGLikelihoodSystematicsDBReader
QGLikelihoodSystematicsDBWriter
QGLikelihoodSystematicsESProducer
QGLikelihoodSystematicsObject	QGLikelihoodSystematicsObject containing the parameters for the systematic smearing
Entry
QGLikelihoodSystematicsRcd
QGSPCMS_BERT_EML
QGSPCMS_BERT_HP_EML
QGSPCMS_FTFP_BERT
QGSPCMS_FTFP_BERT_EML
QGSPCMS_FTFP_BERT_EMM
QGSPCMS_FTFP_BERT_EMN
QGSPCMS_FTFP_BERT_EMY
QGSPCMS_FTFP_BERT_EMZ
QGTagger
QIE10DataFrame
Sample
QIE10Task
QIE11DataFrame
Sample
QIE11Task
QIE8Simulator
QieShape
Qjets
QjetsAdder
QjetsBaseExtras
QjetsPlugin
Quad
QualityCutsAnalyzer
histogram_element_t
histogram_t
QualityFilter
QualityTester
Quantile
QuarkoniaTrackSelector
QueryAttrHandler
QueryAttrState
QuickTrackAssociatorByHitsImpl	TrackToTrackingParticleAssociator that associates by hits a bit quicker than the normal TrackAssociatorByHitsImpl class
QuickTrackAssociatorByHitsProducer