Dunnart is a prototype constraint-based diagram editor. It includes standard diagram editing capabilities, as well as advanced features such as constraint-based geometric placement tools (alignment, distribution, separation, non-overlap, and page containment), automatic object-avoiding poly-line connector routing, and continuous network layout.
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Tim Dwyer, Kim Marriott, and Michael Wybrow.
Dunnart: A constraint-based network diagram authoring tool.
In Proceedings of 16th International Symposium on Graph Drawing (GD’08), LNCS 5417, pages 420–431. Springer-Verlag, 2009