Slicer  4.13
Slicer is a multi-platform, free and open source software package for visualization and medical image computing

Units → Libs Relation

File in Modules/Loadable/UnitsIncludes file in Libs
Logic / vtkSlicerUnitsLogic.hMRML / Logic / vtkMRMLAbstractLogic.h
Widgets / qMRMLUnitWidget.hMRML / Widgets / qMRMLWidget.h