Here is a list of all namespaces with brief descriptions:

Nbar
NEpetra_Import_Util [external]
Nepetra_test [external]
Nfoo
NKokkos
NExample
NFENL
NImpl
Nmy_namespace
Ntesting
Nnamespace1
Nnamespace2
Nproto2
NSacado
NCacheFad	Namespace for forward-mode AD classes w/caching
NELRCacheFad	Namespace for expression-level reverse forward-mode AD classes
NELRFad	Namespace for expression-level reverse forward-mode AD classes
NFad	Namespace for forward-mode AD classes
NExp
NImpl
NPowerImpl
NPowerImpl
NFAD_NS
NFlopCounterPack
NImpl
NLFad	Namespace for logical forward-mode AD classes
Nmpl
Nplaceholders
NRad
NRad2
NRad2d
NRadnt
NRadVec
NTay	Namespace for Taylor polynomial AD classes
Nstd
Ntesting
Ngmock_function_mocker_test
Ngmock_generated_actions_test
Naction_test
Ngmock_matchers_test
Nconvertible_from_any
Nmatcher_test
Nadl_test
Ngmock_more_actions_test
Ngmock_nice_strict_test
Ngtest_printers_test
Ninternal
Nedit_distance
Ngmockpp
Ninternal_stream
Ninvoke_argument
Nposix
NTeuchos
Nworks_here