The 1.0.1 version of Markoff for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. This free Mac app was originally produced by thoughtbot, inc. The program lies within Productivity Tools, more precisely Office Tools.
From the developer:
Markoff is a lightweight Markdown previewer that allows you to open any Markdown file and preview it in a stylized HTML rendering. The application recognizes YAML front-matter and shows it as a code snippet. The program showss up-to-date word and character count.
You may want to check out more software for Mac, such as PDFMergeThing, which might be similar to Markoff.