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Graphviz

Graphviz is an open source visualization software that could represent structural information in subjects such as networking, software design and architecture, visual interfaces and machine learning. Users write descriptions of structured information in a simple text language and the Graphviz layout engine generate output graphs.

/* This sample script generates a graph of typical steps during software compilation */ digraph G { main -> parse -> execute main -> init main -> cleanup execute -> make_string execute -> printf init -> make_string main -> printf execute -> compare }