nwdiag is a Python tool to generate network-diagram image file from spec-text file. You can get some examples and generated images on tk0miya.bitbucket.org. Setup: by easy_install Make environment: easy_install nwdiag by buildout Make environment: hg clone http://bitbucket.org/tk0miya/nwdiag cd nwdiag python bootstrap.py bin/buildout spec-text setting sample Few examples are available. You can get more examples at tk0miya.bitbucket.org. simple.diag simple.diag is simply define nodes and transitions by dot-like text format: diagram { A -> B -> C; lane you { A; B; } lane me { C; } } Usage: Execute nwdiag command: nwdiag simple.diag ls simple.png simple.png Here are some key features of "nwdiag":