Here is a list of all namespaces with brief descriptions:

[detail level 123]

NAIDA
Nantilightions
►Nboost
►Npython
Ncontainer_utils
Ndetail
NCexmcPrivate
Ncheprep
►NCLHEP
Ndetail
Nsp
Ntt
NCompileTimeConstraints
Ndemo
Nemcalc_gui
Nemcalculator
NEmPlot
Neplot
NExN03
NFilterMode
NG4AblaRandom
NG4Analysis
NG4ArrayOps
NG4AttDefStore
NG4AttFilterUtils
NG4AttUtils
NG4AutoDelete
NG4ConversionUtils
NG4Csv
NG4DimensionedTypeUtils
NG4ExpConsts
NG4FFGDefaultValues
NG4FFGEnumerations
NG4HadSignalHandler_local
NG4Hbook
►NG4INCL
NClusterDecay	Namespace for functions that handle decay of unstable clusters
NCrossSections
NDeJongSpin
NDeuteronDensity	Static class for the deuteron density
NIntersectionFactory
NKinematicsUtils
NLogger
NMath
NNuclearDensityFactory
NNuclearDensityFunctions
NNuclearPotential
NParticleConfig
NParticleTable
NPhaseSpaceDecay
NPhysicalConstants
NRandom
NRootFinder
NString
NG4InuclParticleNames
NG4InuclSpecialFunctions
NG4LogConsts
NG4ModelCommandUtils
NG4PhononPolarization
NG4Root
NG4Threading
NG4TrajectoryDrawerUtils
NG4Xml
Ngammaraytel
NHepGeom
NHEPREP
NHepTool
NJA
NLesson1
NLesson1withN03
NLesson1Wx
NLesson2Wx
Nlightions
Nmcscore
Nmcscorerootio
Nplotall
Nplotfiles
Nplottest35
Npplot
NpyEMSTDpl
NpyExN01pl
NpyExN03geom
NpyExN03pl
NpyEZgeom
NpyG4Box
NpyG4ChordFinder
NpyG4Cons
NpyG4Element
NpyG4Ellipsoid
NpyG4EllipticalCone
NpyG4EllipticalTube
NpyG4EmCalculator
NpyG4Event
NpyG4Exception
NpyG4FieldManager
NpyG4GeometryManager
NpyG4Hype
NpyG4Isotope
NpyG4LogicalVolume
NpyG4MagneticField
NpyG4Material
NpyG4Orb
NpyG4Para
NpyG4ParticleGun
NpyG4ParticleTable
NpyG4Polycone
NpyG4Polyhedra
NpyG4PrimaryVertex
NpyG4ProcessManager
NpyG4ProcessTable
NpyG4ProcVector
NpyG4PVPlacement
NpyG4RotationMatrix
NpyG4RunManager
NpyG4RunManagerKernel
NpyG4Sphere
NpyG4StackManager
NpyG4Tet
NpyG4ThreeVector
NpyG4Torus
NpyG4Trap
NpyG4Trd
NpyG4Tubs
NpyG4TwistedBox
NpyG4TwistedTrap
NpyG4TwistedTrd
NpyG4TwistedTubs
NpyG4UIcommand
NpyG4UIcommandTree
NpyG4UImanager
NpyG4UIterminal
NpyG4UserStackingAction
NpyG4VCrossSectionHandler
NpyG4VisAttributes
NpyG4VisManager
NpyG4VModularPhysicsList
NpyG4VPhysicalVolume
NpyG4VPhysicsConstructor
NpyG4VProcess
NpyG4VSensitiveDetector
NpyG4VTouchable
NpyG4VUserDetectorConstruction
NpyG4VUserPhysicsList
NpyG4VUserPrimaryGeneratorAction
Npyglobals
NpyMedicalBeam
NpyParticleGun
NpyPhysicsLists
NpyQgeom
NpyRandomize
►Npython
Ncolortable
Ng4thread
Ng4viscp
Nhepunit
►Npython3
Ncolortable
Ng4thread
Ng4viscp
Nhepunit
Nread_gdml
NreadPY
Nroot_test
Ntest
Ntest1
Ntest2
Ntest3
Ntest_voxel
Ntestem0
►Ntools
Nhisto
Nwroot
NUUtils
Nwindef
Nwrite_gdml
NWt