Graphviz

Graphviz is a free, open-source graph visualization software. The current stable release for Graphviz Windows is Graphviz-2.28.0.msi. Graphviz represents structural data as diagrams of networks and abstract graphs. It has valuable applications in bioinformatics, networking, database and Web design, software engineering, visual interfaces of other technical domains and machine learning. The layout programs of Graphviz can take graph descriptions as simple text language and make useful diagram formats as SVG for Web pages, images and Postscript or PDF for other document inclusions, or it can display graphs through an interactive graph browser. Graphviz also supports GXL format. This software features options for fonts, tabular node layouts, colors, hyperlinks, line styles and Rolland custom shapes among others for its concrete diagrams. DOT format is used for layered or hierarchical drawings of directed graphs. “Spring model’ layouts in NEATO format are the default tools for graphs that are not too large [around 100 nodes]. NEATO aims to perform statistical multidimensional scaling by minimizing global energy function. Spring model layouts similar to NEATO but reduce forces instead of working on energy function use FDP format. SFDP is the multi-scale version of FDP for large graph layouts. TWOPI are radial layouts after Graham Wills 97. Nodes are located in concentric circles with their distance depending on a certain root node. CIRCO are circular layouts after Wiese 02, Kauffman and Six and Tollis 99. This type of layout is apt for multiple cyclic structure diagrams like telecommunications networks.

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