Here is a list of all documented namespaces with brief descriptions:

[detail level 123456]

▼NiText
►NBarcodes
NDmcode
NExceptions
NQrcode
►NBouncycastle
►NAsn1
NCmp
NCms
NEsf
NEss
NOcsp
NPcks
NTsp
NUtil
NX509
►NCert
NOcsp
NCms
►NCrypto
NGenerators
NModes
NMath
NOpenssl
NOperator
NSecurity
NTsp
NX509
►NBouncycastleconnector
NLogs
►NBouncycastlefips
►NAsn1
NCmp
NCms
NEsf
NEss
NOcsp
NPcks
NTsp
NUtil
NX500
NX509
►NCert
NOcsp
NCms
►NCrypto
NGenerators
NModes
NMath
NOpenssl
NOperator
NSecurity
NTsp
NX509
►NCommons
►NActions
NConfirmations
NContexts
NData
NProcessors
NProducer
NSequence
►NBouncycastle
►NAsn1
NCmp
NCms
NEsf
NEss
NOcsp
NPkcs
NTsp
NUtil
NX500
NX509
►NCert
NOcsp
NCms
►NCrypto
NGenerators
NModes
NMath
NOpenssl
NOperator
NSecurity
NTsp
NX509
NDatastructures
NDigest
NExceptions
NLogs
►NUtils
NCollections
►NForms
NExceptions
►NFields
NBorders
NMerging
NProperties
►NForm
NElement
►NRenderer
NCheckboximpl
NLogs
NUtil
NXfa
NXfdf
►NIO
NCodec
NColors
NExceptions
►NFont
NCmap
NConstants
►NOtf
NLookuptype5
NLookuptype6
NLookuptype7
NLookuptype8
NWoff2
NImage
NLogs
NSource
NUtil
►NKernel
►NActions
NData
NEvents
►NColors
NGradients
►NCrypto
NSecurityhandler
►NDI
NPagetree
NExceptions
NFont
NGeom
NLogs
NMac
NNumbering
►NPdf
NAction
►NAnnot
NDA
►NCanvas
NDraw
►NParser
NClipperLib
NData
NFilter
NListener
NUtil
NWmf
NCollection
►NColorspace
NShading
NEvent
NExtgstate
NFilespec
NFilters
►NFunction
NUtils
NLayer
NNavigation
NStatistics
NTagging
NTagutils
NXobject
►NUtils
NAnnotationsflattening
NCheckers
NObjectpathitems
►NValidation
NContext
►NXMP
►NImpl
NXPath
NOptions
NProperties
►NLayout
NBorders
NElement
NExceptions
►NFont
NSelectorstrategy
NHyphenation
NLayout
NLogs
NMargincollapse
NMinmaxwidth
►NProperties
NGrid
►NRenderer
NObjectfit
NTypography
NSplitting
NTagging
►NValidation
NContext
►NPdfa
NChecker
NExceptions
NLogs
►NPdfua
►NCheckers
►NUtils
NHeadings
NTables
NExceptions
NLogs
►NSignatures
NCms
NExceptions
NLogs
NMac
►NValidation
NContext
NExtensions
NReport
►NStyledXmlParser
►NCss
NFont
NMedia
NPage
►NParse
NSyntax
NPseudo
►NResolve
►NShorthand
NImpl
►NSelector
NItem
NUtil
►NValidate
►NImpl
NDatatype
NDeclaration
NExceptions
NLogs
►NNode
►NImpl
►NJsoup
NNode
►NResolver
NFont
NResource
NUtil
►NSvg
NConverter
►NCss
NImpl
NElement
NExceptions
NLogs
►NProcessors
►NImpl
NFont
►NRenderers
NFactories
NImpl
►NPath
NImpl
NUtils
NXobject