GraphViz

doc,

Commands include:

• dot - draws directed graphs
• dotty - editor for dot graphs
• neato - graph based drawing program
• lefty - draws undirected graphs

Dot

Example

File graph1.dot:

digraph G {
  main -> parse -> execute;
  main -> init;
  main -> cleanup;
  execute -> make_string;
  execute -> printf;
  init -> make_string;
  main -> printf;
  execute -> compare;
}