I’m having to use the AT&T Graphviz tools quite a bit for generate graphs for my research. As I like programming in Python, I decided to write a simple wrapper that would go and call the actual tools. This wrapper lets you create and save neatly-formatted dot files and also provides and easy interface to render them. I use it on an interactive web page to generate graphs on the fly. It can’t load graphviz files yet, not sure if I’ll ever get around to that. Anyway, you can find that on my projects page.