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Looking for a graph layout framework for iOS

For an iOS application I'm making I need to show groups of elements grouped together according to their type, and different groups of types separated from each other in a nicely done layout. I thought of using an undirected graph, with the grouped nodes all pointing to each other in a sort of circular reference, and then each group as another "meta-graph" with their nodes point at each other in a circular reference as well, hoping that together with a good graph layout framework this could be displayed nicely. Unfortunately, the only framework I keep hearing of is graphviz , but that doesn't seem to have an available port for iOS. So my question is either: Other ideas for how to implement what I need? A good implementation of graph layout for the iOS? An available port of graphviz for the iOS? Update : Please note, I am not looking for graph plotting frameworks, which are the frameworks used to draw graphs and charts (such as pie charts etc)