Download of MonsterWriter 1.23.2 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The application is included in Productivity Tools. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The actual developer of this Mac application is Oliver Wolf.
From the developer:
MonsterWriter is optimized for sophisticated content. You can use it for any kind of text, you will love it when you have to write academic content. It is an enjoyable desktop app for writing a thesis or paper. You just focus on the content and the structure of the document since MonsterWriter takes care of the final appearance of your writing.
Your project can be exported as PDF, LaTeX, HTML, or Markdown.
You may want to check out more Mac applications, such as PDFMergeThing, which might be similar to MonsterWriter.