Q260889

thumb|250px|right|A red–black tree plotted by Graphviz thumb|250px|right|Undirected graph showing adjacency of the 48 contiguous United States thumb|250x250px|A visualization of a JavaScript life cycle made by using Graphviz Graphviz (short for Graph Visualization Software) is a package of open-source tools initiated by AT&T Labs Research for drawing graphs (as in nodes and edges, not as in bar charts) specified in DOT language scripts having the file name extension "gv". It also provides libraries for software applications to use the tools. Graphviz is free software licensed under the Eclipse Public License.

== Tools == dot : a command-line tool to produce layered graph drawings in a variety of output formats, such as (PostScript, PDF, SVG, annotated text and so on). neato : useful for undirected graphs up to about 1000 nodes. "Spring model" layout minimizes global energy. fdp : force-directed graph drawing similar to "spring model", but minimizes forces instead of energy. Useful for undirected graphs. sfdp : multiscale version of fdp for the layout of large undirected graphs. twopi : for radial graph layouts. Nodes are placed on concentric circles depending on their distance from a given root node. circo : circular layout. Suitable for certain diagrams of multiple cyclic structures, such as certain telecommunications networks. dotty : a graphical user interface to visualize and edit graphs. lefty : a programmable (in a language inspired by EZ) widget that displays DOT graphs and allows the user to perform actions on them with the mouse. Therefore, Lefty can be used as the view in a model–view–controller GUI application that uses graphs. gml2gv, gv2gml: convert to/from GML, another graph file format. graphml2gv: convert a GraphML file to the DOT format. gxl2gv, gv2gxl: convert to/from GXL, another graph file format.