Slicer  4.8
Slicer is a multi-platform, free and open source software package for visualization and medical image computing

SubjectHierarchyPlugins → SubjectHierarchy Relation

File in Modules/Loadable/Segmentations/SubjectHierarchyPluginsIncludes file in Modules/Loadable/SubjectHierarchy
qSlicerSubjectHierarchySegmentationsPlugin.hWidgets / qSlicerSubjectHierarchyAbstractPlugin.h
qSlicerSubjectHierarchySegmentsPlugin.hWidgets / qSlicerSubjectHierarchyAbstractPlugin.h