R Markdown
R Markdown documents are fully reproducible. Use a productive notebook interface to weave together narrative text and code to produce elegantly formatted output. Use multiple languages including R, Python, and SQL. R Markdown supports dozens of static and dynamic output formats including HTML, PDF, MS Word, Beamer, HTML5 slides, Tufte-style handouts, books, dashboards, shiny applications, scientific articles, websites, and more. R Markdown provides an authoring framework for data science. You can use a single R Markdown file to both. When you open the file in the RStudio IDE, it becomes a notebook interface for R. You can run each code chunk by clicking the icon. RStudio executes the code and display the results inline with your file.
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Archimedes
Archimedes is a Markdown and LaTeX editor built from the ground up for the Mac and designed to make mathematical writing fun and easy.
At its core, Archimedes is a fully-featured plain text and Markdown editor. It includes a fast syntax highlighter and provides convenient keyboard shortcuts for common actions, such as inserting images and links. With complete support for Markdown, Archimedes makes formatting and structuring documents elegant and easy.
In Math Mode, Archimedes lets you write mathematics in a subset of LaTeX, making it an approachable LaTeX editor. Just enter $$ to get started. Over 700 intuitive commands, such as \sqrt{a^2 + b^2}, help you produce stunning mathematical output. Archimedes even autocompletes commands and intelligently matches closing braces, brackets, and parenthesis as you type.
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Byword
Draft a blog post, write that story or complete a school report wherever you are. Use Markdown to format text with easy keyboard shortcuts, subtle syntax highlighting, word counters with live update, and much more. All your documents, on all your devices. With iCloud and Dropbox, you can create documents in Byword on your Mac and access them on your iPad, iPhone, and iPod touch. And vice versa. You can edit them from anywhere, on any device you use. Byword includes complete Markdown support. Preview your documents in app, export to HTML, PDF, rich text, or publish directly to Medium, WordPress, Blogger, Tumblr and Evernote. The lack of support for rich text is due to technical limitations and limited development resources. We are evaluating the cost/benefit of investing in rich text support of iOS. Meanwhile, we strongly recommend opting for plain text and markdown format for your documents. Macworld has a great article explaining why opting for plain text today is a good idea.
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ghostwriter
Enjoy a distraction-free writing experience, including a full screen mode and a clean interface. With Markdown, you can write now, and format later. The built-in light and dark themes provide an aesthetic writing experience out of the box. If the these are not enough, you can create your very own! Preview your Markdown document in HTML. With the live preview, you can copy the HTML to paste into your blog, or export to another format. The live preview is optimized for large documents, so you can work carefree without worrying about the application freezing as you type. In addition to displaying a live word count at the bottom of the window, ghostwriter displays even more live statistics in its Document Statistics and Session Statistics sidebar tabs. Easily create image URLs within your Markdown document by dragging and dropping an image from your file system into ghostwriter's editor.
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