Here is a list of all namespaces with brief descriptions:

[detail level 123]

Nconf
Nddt
NddtAboutViewerDialog
NddtBiasDialog
NddtBinaryTableDialog
NddtColourmapDialog
NddtColourmapWidget
NddtCubeNavigationWidget
NddtCursorInfoWidget
NddtCutValuesDialog
NddtCutValuesWidget
NddtDataStreamDialog
NddtDataStreamWidget
NddtDialog
NddtDialogFactory
NddtDistanceDialog
NddtFileBasedOverlay
NddtFITSHeaderDialog
NddtFlipRotateWidget
NddtGraphicalElement
NddtGraphicalElementCompass
NddtGraphicalElementCross
NddtGraphicalElementEllipse
NddtGraphicalElementLine
NddtGraphicalElementPickMarker
NddtGraphicalElementProperties
NddtGraphicalElementRectangle
NddtGraphicalElementRefLine
NddtGraphicalElementsDialog
NddtGraphicalElementSlit
NddtGraphicalElementStatRectangle
NddtGraphicalElementText
NddtGraphicalOverlay
NddtGraphicsControlDialog
NddtGraphicsView
NddtGraphicsViewDraw
NddtHDUDialog
NddtImageScaleWidget
NddtImageWidget
NddtMagnificationDialog
NddtMagnificationWidget
NddtMetadataSampleDialog
NddtOverlayRendering
NddtPanningWidget
NddtPickObjectDialog
NddtPVCMDialog
NddtReferenceLineDialog
NddtScaleButtonsWidget
NddtScaleRotateCutDialog
NddtSlitDialog
NddtStatisticDialog
NddtTabularRegionDialog
NddtWidget
NpointGrabber
NpyDdtBroker
▼NpyDdtImageWidget
NpyDdtImageWidget
▼NpyDdtMultiStreamViewer
NmultiStreamViewer
▼NpyDdtPlotsViewer
NplotsViewer
▼Nwidgets
NgraphWidget
NplotStreamWidget
NsubscriberParametersWidget
NpyDdtRemoteClient
NpyDdtSamplePublisher
▼NpyDdtViewer
Nviewer
Nshiboken_helper
NtestPyDdtDataTransfer
NtestPyDdtDataVisualisation
NtestPyDdtUtils
NtestPyImageHandling
NUi
Nwscript