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

Nbc6h_enc
NGrindstone
NAi
NAssetFunctions
NAssets
NAssetPackSerializer
NAudio
NBuildSettings
NContainers
NECS
NEditor
NImguiEditor
NSettings
NWidgets
NImporters
NScriptBuilder
NEvents
NFormats
NAnimation
NV1
NDDS
NModel
NV1
NPipelines
NV1
NRig
NV1
NGraphicsAPI
NOpenGL
NVulkan
NHash
NImporters
NInput
NLogger
NMath
NMemory
NAllocatorCore
NAllocators
NPhysics
NBroadPhaseLayers
NJolt
NLayers
NPipelineAssetMetaData
NPlugins
NProfiler
NReflection
NRenderer
NRendering
NSceneManagement
NScripting
NCSharp
NUtilities
NModules
NUtils
NImGui
NImGuiWidgetFlameGraph
NJPH
Nstd