OmniGraffle is based on graphviz (and costs $99 vs. MS Visio $200.) With a bit of learning and patience you can draw graphs with graphviz by yourself. With the

OmniGraffle is based on graphviz (and costs $99 vs. MS Visio $200.) With a bit of learning and patience you can draw graphs with graphviz by yourself. With the added value of being able to script the graphs and perhaps use templates. It's not as hard as it looks at first. http://www.graphviz.org/Gallery.php http://www.graphviz.org/Gallery.php