DrawDown 1.1.1 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The actual developer of this software for Mac is RED When Excited. We recommend checking the downloaded files with any free antivirus. The software is included in Design & Photo Tools.
From the developer:
DrawDown has been inspired by John Gruber's Markdown and has very similar goals. Enable a human readable plain text format to create rich output. Of course images are not like text, so the format respects the domain. Think of it like plain-text Photoshop. Free Command Line Tool Head over to SwiftStudies and download the free command line tool.
You may want to check out more Mac applications, such as Fiberworks Silver, which might be related to DrawDown.