jekyll-ditaa
By matze
This plugin allows you to write ditaa markup within a ditaa block, generate the image file and replace the markup with the image. If the image could not be generated, the plugin falls back to a <pre> block with the ditaa markup.
To install, you must copy the necessary files from the repository to your Jekyll site. Further installation instructions are available in the repository's README.
Once installed, run Jekyll like normal.