Here is a list of all namespaces with brief descriptions:

[detail level 123456]

▼NAssets
►N_UI5
►NRendering
NScripts
NEditor
►NScripts
►NUtil_Scripts
NEditor
NAssetUsageDetectorNamespace
NCameraFXModules
NCameraKeyFrameEvents
▼NCommNet
NNetwork
NOccluders
NCompoundParts
▼NContracts
►NAgents
NMentalities
NParameters
NPredicates
NTemplates
NCursors
NDDSHeaders
NEditorGizmos
▼NEdyCommonTools
NEditorTools
▼NExpansions
►NMissions	A preflight check used for vessel restrictions, this will allow them to be validated before a vessel is launched in the Editor.
NActions
NAdjusters
NEditor	Surface gizmos will show up on the GAP celestial body surface. You can
NFlow
NRuntime
►NScenery
NScripts
NTests	This class receives the event when a kerbal gets in the vessel. optional parameters for location
►NSerenity
NContracts
►NDeployedScience
NRuntime
NRobotArmFX
▼NExperience
NEffects	The EVA Chute Skill represents the kerbals experience requirement in order for them to have access to EVA Chutes. Every trait has a EVAChuteSkill field, and one integer value assigned to it. The value represents the minimum XP point required for a kerbal to unlock the Personal Parachute in Career mode.
▼NFinePrint
►NContracts
NParameters
NUtilities
NFlightUIModeControllerUtil
NHighlighting
NKerbal
NKerbNet
▼NKSP
►NFX
NFireworks
NIO
NLocalization
NTesting
►NUI
NDialogs
NLanguage
NRendering
►NScreens
►NDebugToolbar
►NScreens
NCheats
NContract
NDatabase
NDebug
NGamePlay
NMission
NPhysics
NResources
NSerenity
NEditor
►NFlight
NDialogs
►NMapview
NMapContextMenuOptions
NPartListCategories
►NSettings
►NControls
NValues
►NSpaceCenter
NMissionSummaryDialog
NTooltipTypes
NUtil
NKSPAchievements
▼NKSPAssets
NKSPedia
▼NLibNoise
NModels
NModifiers
NLingoona
▼NLocalization
NEditor
NModuleWheels
NPartToolsLib
NPreFlightTests
NProceduralFairings
NRadiators
▼NRUI
NAlgorithms
►NIcons
NSelectable
NSimple
NSaveUpgradePipeline
NSentinelMission
▼NSmooth
NAlgebraics
NCollections
►NCompare
NComparers
NUtilities
NComparisons
NDelegates
NDispose
NEvents
NPlatform
NPools
►NSlinq
NCollections
NContext
NTest
▼NSoftMasking
NEditor
NExtensions
NSamples
►NTextMeshPro
NEditor
NSteamworks
▼NStrategies
NEffects
NTestScripts
▼NTMPro
NEditorUtilities
NExamples
NSpriteAssetUtilities
NUniLinq
▼NUnityEditor
NUI
▼NUnityEngine
NUI
NUpgradeables
NVectrosity
▼NVehiclePhysics
NEditorTools
NUnityEditor