Download of TextNut 2.50 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The program is included in Productivity Tools. This free Mac application is an intellectual property of Edgenius. 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.
From the developer:
TextNut combines the power of Markdown with the simplicity of rich text editing. It is 100% compatible with CommonMark specification. Unlike most Markdown editors, TextNut provides an unique rich editing mode in which the Markdown marker characters are just triggers. You fully concentrate on the content without the interference of the marker characters. You can switch between rich text and Markdown at any time without losing your text formatting.
You may want to check out more software for Mac, such as TextNutSD, which might be similar to TextNut.