The following two classes are unused and can be removed:

• https://phabricator.mitk.org/source/mitk/browse/develop/Modules/SegmentationUI/Qmitk/QmitkDrawPaintbrushToolGUI.cpp
• https://phabricator.mitk.org/source/mitk/browse/develop/Modules/SegmentationUI/Qmitk/QmitkErasePaintbrushToolGUI.cpp

Edit:
The following classes are unused and can be removed:

• https://phabricator.mitk.org/source/mitk/browse/develop/Modules/SegmentationUI/Qmitk/QmitkCalculateGrayValueStatisticsToolGUI.cpp
• https://phabricator.mitk.org/source/mitk/browse/develop/Modules/SegmentationUI/Qmitk/QmitkPixelManipulationToolGUI.cpp

and their corresponding tools.

The following classes have been removed completely

• mitkCalculateGrayValueStatisticsTool
• mitkCalculateVolumetryTool
• mitkCreateSurfaceToo
• mitkPixelManipulationTool