Here is a list of all namespaces with brief descriptions:

NAlgebraicExpansionUnitTest
NAmesos2
NBelos
NDetails
NConstantExpansionUnitTest
NCoordPart
Ncusp
Ndetail
Ndevice
Ndispatch
Nkrylov
Nprecond
Naggregation
Nrelaxation
NDerivExpansionUnitTest
NDivisionOperatorUnitTest
NDynamicStridedVecTest
NDynamicVecTest
NEpetra_Import_Util [external]
Nepetra_test [external]
NETPCETest
NExponentialRandomFieldUnitTest
NForUQTKExpansionUnitTest
NGramSchmidtTest
NHermiteBasisUnitTest
NHG_1D_Flat_J
NHG_3D
NIfpack2
NDetails
NKokkos
NCompat
NDetails
NExample
NFENL
NExperimental
NImpl
NImpl
NViewError
NKokkosBatched
NKokkosBlas
NImpl
NKokkosKernelsUnitTest
NKokkosSparse
NLegendreBasisUnitTest
NMaskLogic
NMatrixFreeOperatorUnitTest
NPCETest
NProductBasisUtilsUnitTest
NPseudoSpectralExpansionUnitTest
NQuadExpansionUnitTest
NSacado
NETPCE
NFad
NExp
NMP
NPCE
NUQ
NSacadoPCEUnitTest
NSDMUtilsUnitTest
NSmolyakBasisUtilsUnitTest
NSparse3TensorUnitTest
NSparseGridQuadratureUnitTest
NStaticFixedVecTest
NDouble
NComplex_std
NComplex_Kokkos
NStaticVecTest
Nstd
NStieltjesCosTest
NStieltjesExpTest
NStieltjesSinTest
NStokhos	Top-level namespace for Stokhos classes and functions
Nadapt_utils
Ndetail
Ndetails
NImpl
NKL	Namespace for analytic KL expansions
Nmpl
NTensorProductBasisUnitTest
NTensorProductUnitTest
NTest
NTeuchos
Ndetails
NTotalOrderBasisUnitTest
NTpetra
NDetails
NBlas
NKokkosRefactor
NDetails
Nunit_test