Here is a list of all namespaces with brief descriptions:

Nbelfem	USER GUIDES:
Narguments
Narpack
Nassert
Nbanners
Ncell
Nconstant
Ndatabase
Nelectronics
Nfem
Ncalculator
Ndofmgr
Nfacetintpoints
Nmaxwell
Nconfig_tag
Ngasmodels
Ngastables
Ngraph
Nspfa
Nhdf5
Ninput
Nintegration
Nlapack
Nmap
Nmaterial
Nmesh
Ncohomology
Nnormals
Nproto
Node
Nopt
Nparpack
Nprandtlmeyer
Nsolver
Nsparse
Nspline
Ntensor
Nvtk
Ncorc
Nassembler
Nbelfem
Nbuilder
Ncable
Ncaps
Ncurve
Nframe
Njet
Nmshio
Npostprocess
Nshells
Ntests
Ntest_curve_frame
Ntest_lame_e2e
Ntest_multilayer_e2e
Ntest_straight_e2e
Ntest_twist_crosscheck
Ntest_winding
Nwinding
Mdebye
Mintpoints
Nmain
Nmesh
NAsciiFile
NElement
NGmshReader
NGroup
NHex20
NHex27
NHex8
NLine2
NLine3
NMesh
NNode
NPenta15
NPenta18
NPenta6
NPeriodicLink
NPhysical
NPyra14
NPyra5
NQuad4
NQuad8
NQuad9
NTet10
NTet4
NTri3
NTri6
NVertex
Nmumps
Mmumpstools_common	List of Parameters see Parameter list in mumpstools.hpp
Npancake
Nbasecurve
Nexport
Nfem
Ngmsh_geometry
Nlead
Npancake
Nspiral
Ntapestack
Mpardisotools	See also https://software.intel.com/content/www/us/en/develop/articles/pardiso-parameter-table.html
Nplot_iv
Ntest_pancake
Nusermat