Here is a list of all namespaces with brief descriptions:

[detail level 123]

AIDA
boost
python
container_utils
detail
CexmcPrivate
cheprep
CLHEP
detail
sp
tt
CompileTimeConstraints
demo
emcalc_gui
emcalculator
EmPlot
eplot
ExN03
FilterMode
G4AttDefStore
G4AttFilterUtils
G4AttUtils
G4Chips
G4ConversionUtils
G4Csv
G4DimensionedTypeUtils
G4HadSignalHandler_local
G4Hbook
G4INCL
Math
NuclearDensityFunctions
NuclearPotential
ParticleConfig
PhysicalConstants
G4InuclParticleNames
G4InuclSpecialFunctions
G4ModelCommandUtils
G4Root
G4TrajectoryDrawerUtils
G4Xml
gammaraytel
HepGeom
HEPREP
HepTool
JA
Lesson1
Lesson1withN03
Lesson1Wx
Lesson2Wx
mcscore
mcscorerootio
plotall
plotfiles
plottest35
pplot
pyEMSTDpl
pyExN01pl
pyExN03geom
pyExN03pl
pyEZgeom
pyG4Box
pyG4ChordFinder
pyG4Cons
pyG4Element
pyG4Ellipsoid
pyG4EllipticalCone
pyG4EllipticalTube
pyG4EmCalculator
pyG4Event
pyG4Exception
pyG4FieldManager
pyG4GeometryManager
pyG4Hype
pyG4Isotope
pyG4LogicalVolume
pyG4MagneticField
pyG4Material
pyG4Orb
pyG4Para
pyG4ParticleGun
pyG4ParticleTable
pyG4Polycone
pyG4Polyhedra
pyG4PrimaryVertex
pyG4ProcessManager
pyG4ProcessTable
pyG4ProcVector
pyG4PVPlacement
pyG4RotationMatrix
pyG4RunManager
pyG4RunManagerKernel
pyG4Sphere
pyG4StackManager
pyG4Tet
pyG4ThreeVector
pyG4Torus
pyG4Trap
pyG4Trd
pyG4Tubs
pyG4TwistedBox
pyG4TwistedTrap
pyG4TwistedTrd
pyG4TwistedTubs
pyG4UIcommand
pyG4UIcommandTree
pyG4UImanager
pyG4UIterminal
pyG4UserStackingAction
pyG4VCrossSectionHandler
pyG4VisAttributes
pyG4VisManager
pyG4VModularPhysicsList
pyG4VPhysicalVolume
pyG4VPhysicsConstructor
pyG4VProcess
pyG4VSensitiveDetector
pyG4VTouchable
pyG4VUserDetectorConstruction
pyG4VUserPhysicsList
pyG4VUserPrimaryGeneratorAction
pyglobals
pyMedicalBeam
pyParticleGun
pyPhysicsLists
pyQgeom
pyRandomize
python
colortable
g4thread
g4viscp
hepunit
python3
colortable
g4thread
g4viscp
hepunit
read_gdml
readPY
root_test
test
test1
test2
test3
test_voxel
testem0
windef
write_gdml