Here is a list of all namespaces with brief descriptions:

[detail level 12345]

Ncxx14
Ndetail
Nhoudini_utils
Nnanovdb
Nio
Ntools
Nmorphology
Nutil
Nimpl
Nmorphology
Nopenvdb
Nv13_0
Nax
Nast
Ntokens
Ncodegen
Nmath
Ncompression
Nio
Nlogging
Nmath
Npcg
Npoints
Nattribute_traits
Nfuture	A container for ABI=5 to help ease introduction of upcoming features
Nindex
Nstring
Nthread
Ntools
Ncomposite
Nds
Ngridop
Nlocal_util
Nlstrack
Nmorphology
Npoisson
NScheme
Nvalxform
Ntree
Niter
Nleafmgr
Nutil
Nopenvdb_houdini
Nnode_info_text	Namespace to hold functionality for registering info text callbacks. Whenever getNodeSpecificInfoText() is called, the default info text is added to MMB output unless a valid callback has been registered for the grid type
Nstd