Here is a list of all namespaces with brief descriptions:

[detail level 12345]

ic5CaloJets_cfi
IC5CaloJetsMCFlavour_cff
ic5GenJets_cfi
ic5JetID_cfi
ic5JetTracksAssociatorAtVertex_cfi
ic5JetVertexCompatibility_cfi
ic5PFJets_cfi
ic5PFJetTracksAssociatorAtVertex_cfi
ic5TrackJets_cfi
ic7JetID_cfi
idDealer
idealForDigiCscGeometry_cff
idealForDigiCscGeometryDB_cff
idealForDigiDtGeometry_cff
idealForDigiDtGeometryDB_cff
idealForDigiTrackerGeometry_cff
idealForDigiTrackerGeometryDB_cff
idealForDigiTrackerSLHCGeometry_cff
idealGeomPlusEE_cfi
idealTransformation
IgProfInfo
IgProfTrigger
iguana_TBH4_2007_cfg
impactParameter_cff
impactParameter_cfi
impactParameterMVABJetTags_cfi
impactParameterMVAComputer_cfi
Impl
AlCa
AlCaLumiPixels
AlCaP0
AlCaPhiSymEcal
AlCaTestEnable
cosmics
cosmicsRun2
DataScouting
hcalnzs
HeavyIons
pp
ppRun2
preprodmc
prodmc
relvalgen
relvalmc
relvalmcfs
Test
InclusiveppMuX_7TeV_cfi
InclusiveppMuX_8TeV_cfi
InclusiveppMuX_8TeV_TuneCUETP8M1_cfi
InclusiveppMuX_cfi
inclusiveSecondaryVertexFinderTagInfos_cfi
inclusiveVertexFinder_cfi
inclusiveVertexing_cff
inconsistentMuonPFCandidateFilter_cfi
indexGen
indexGenCompare
info_dqm_sourceclient-live_cfg
InitialStep_cff
InitRootHandlers_cfi
inOutSeedsFromTrackerMuons_cfi
inputfiles
inputFilesetParser
inputsource_file_cfi
insertMaterial
Inspector
IntegrityClient_cfi
IntegrityTask_cfi
interactiveExample
interactivePythonTest
interestingDetIdCollectionProducer_cfi
interestingDetIdFromSuperClusterProducer_cfi
interestingEgammaIsoDetIdsSequence_cff
interestingEleIsoDetIdModule_cff
interestingGamIsoDetIdModule_cff
IOFlags
IOMC_cff
IOMC_EventContent_cff
iov_list_tag
iovInspector
IOVObj
ipf2pat
iptCorrector_cfi
IPTools
islandBasicClusters_cfi
islandClusteringSequence_cff
islandSuperClusters_cfi
isoAnalyzer_cfi
isoDepositProducerIOBlocks_cff
isoDeposits_cfi
isolatedGenParticles_cfi
isolatedPartcilesGen_cfi
IsolatedTauJetsSelector_cfi
isolatedTracksCone_cfi
isolatedTracksHcalScale_cfi
isolatedTracksNxN_cfi
isolation
isolation_cff
isolationCalculator_cfi
isolPixelTrackProd_cfi
isoMuonHLT_cfi
isoTrackCalib
isoTrig_cfi
IterativeCandidateProducer_cff
iterativeCone5JTA_cff
IterativeConePu5Jets_PbPb_cff
IterativeDetachedTripletStep_cff
IterativeInitialStep_cff
IterativeLowPtTripletStep_cff
IterativeMixedTripletStep_cff
IterativePixelLessStep_cff
IterativePixelPairStep_cff
iterativeTk_cff
IterativeTobTecStep_cff
IterativeTrackFilter_cff
IterativeTracking_cff
IterativeTrackMerger_cff
IterativeTrackProducer_cff
IterativeTrackSeedProducer_cff
IterTrackingModules4seedMonitoring_cfi