Slicer  5.3
Slicer is a multi-platform, free and open source software package for visualization and medical image computing

Widgets → Libs Relation

File in Modules/Loadable/Models/WidgetsIncludes file in Libs
qMRMLModelDisplayNodeWidget.hMRML / Widgets / qMRMLScalarsDisplayWidget.h
qMRMLModelDisplayNodeWidget.hMRML / Widgets / qMRMLWidget.h