Here is a list of all namespaces with brief descriptions:

Ndbselect [external]
NeventDispenser [external]
Ng4dialog [external]
Ng4display [external]
Ng4system [external]
Ngaction [external]
Ngboard [external]
Ngdetector [external]
Ngdigi_data
Ngdynamicdigitization [external]
Ngemc [external]
Ngemc_units [external]
Ngevent_data
Ngeventaction [external]
Ngeventheader
Ngfactory [external]
Ngfields [external]
Ngoptions [external]
Ngparticle [external]
Ngphysics [external]
Ngprimaryaction [external]
Ngqtbuttonswidget [external]
Ngrun [external]
Ngrun_data
Ngrun_header
Ngrunaction [external]
Ngsensitivedetector [external]
Ngsplash [external]
Ngstreamer [external]
Ngsystem [external]
Ngtouchable [external]
NgtranslationTable [external]
Ngtree [external]
Ngtrue_data
Ngutilities [external]