| IColor | OGDF.Color.Interface, OGDF.Color, OGDF |
| IDPoint | OGDF.DPoint.Interface, OGDF.DPoint, OGDF |
| IDRect | OGDF.DRect.Interface, OGDF.DRect, OGDF |
| IEdgeElement | OGDF.EdgeElement.Interface, OGDF.EdgeElement, OGDF |
| IFastSimpleHierarchyLayout | OGDF.FastSimpleHierarchyLayout.Interface, OGDF.FastSimpleHierarchyLayout, OGDF |
| IFMMMLayout | OGDF.FMMMLayout.Interface, OGDF.FMMMLayout, OGDF |
| IGraph | OGDF.Graph.Interface, OGDF.Graph, OGDF |
| IGraphAttributes | OGDF.GraphAttributes.Interface, OGDF.GraphAttributes, OGDF |
| IGraphIO | OGDF.GraphIO.Interface, OGDF.GraphIO, OGDF |
| IHierarchyLayoutModule | OGDF.HierarchyLayoutModule.Interface, OGDF.HierarchyLayoutModule, OGDF |
| ILayerByLayerSweep | OGDF.LayerByLayerSweep.Interface, OGDF.LayerByLayerSweep, OGDF |
| ILayeredCrossMinModule | OGDF.LayeredCrossMinModule.Interface, OGDF.LayeredCrossMinModule, OGDF |
| ILayoutModule | OGDF.LayoutModule.Interface, OGDF.LayoutModule, OGDF |
| IList | OGDF.List.Template |
| IListIterator | OGDF.ListIterator.Template |
| IMedianHeuristic | OGDF.MedianHeuristic.Interface, OGDF.MedianHeuristic, OGDF |
| INodeElement | OGDF.NodeElement.Interface, OGDF.NodeElement, OGDF |
| IOptimalHierarchyLayout | OGDF.OptimalHierarchyLayout.Interface, OGDF.OptimalHierarchyLayout, OGDF |
| IOptimalRanking | OGDF.OptimalRanking.Interface, OGDF.OptimalRanking, OGDF |
| IRankingModule | OGDF.RankingModule.Interface, OGDF.RankingModule, OGDF |
| ISugiyamaLayout | OGDF.SugiyamaLayout.Interface, OGDF.SugiyamaLayout, OGDF |