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

NGmAttributeResultsManager [external]
NGmCellGeometryMetadata [external]
NGmCellMesh [external]
NGmDoubleCmp [external]
NGmFileIOUtils [external]
NGmGeometryUtils [external]
NGmHdf5ModelReader [external]
NGmLuaIntegrationRuleUtils [external]
NGmLuaInterpolatorUtils [external]
NGmLuaTaskUtils [external]
NGmLuaUtils [external]
NGmMathUtils [external]
NGmMatrixUtils [external]
NGmMemoryDump [external]
NGmMeshGaussToElementNodeInterpolator [external]
NGmMeshPointCloudInterpolator [external]
NGmMeshUtils [external]
NGmNfFileFormat [external]
NGmNfFileWriter [external]
NGmParseUtils [external]
NGmpMechanicUtils	Groups utilitary routines for working with stress
NGmPolygonTriangulator [external]
NGmResultsTimeManager [external]
NGmRunProgressReport [external]
NGmSingleAppendBuffer [external]
NGmStateDumpBufferDataItem [external]
NGmValueSetEvalContext [external]
NGmVectorCSxSparseMatrixLayoutBuilder [external]
NGmVectorUtils [external]
NGmXdmfHdf5 [external]
NLuaProxy [external]
NQt [external]