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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Quiver
Quiver is a notebook built for programmers. It lets you easily mix text, code, Markdown and LaTeX within one note, edit code with an awesome code editor, live preview Markdown and LaTeX, and find any note instantly via the full-text search. A note in Quiver is comprised of cells, snippets of text, code, Markdown, LaTeX (via MathJax) or diagrams (sequence diagram, flowchart). You can freely mix different cell types within one note. You can set different languages for different code cells, too. The programmer's notebook should make code editing effortless. Quiver packs the awesome ACE code editor in code cells, with syntax highlighting support for more than 120 languages, over 20 themes, automatic indent and outdent, and much more. Quiver lets you write in Markdown with inline formatting and custom CSS options. A live preview window renders Markdown as you type. Quiver uses MathJax to typeset mathematical equations written in LaTeX.
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Dillinger
Dillinger is a cloud-enabled HTML5 Markdown editor that can be used offline and is powered by AngularJS. Markdown is a lightweight markup languages that uses the same formatting conventions as email. Drag and drop HTML files into Dillinger to convert them to Markdown. Drag and drop Markdown or HTML files into Dillinger. You can export documents as Markdown, HTML, and PDF. The text you see is actually written in Markdown. To get an idea of Markdown's syntax, simply type some text in the left window and then watch the results in right. Drag and drop images (requires your Dropbox account be linked). Import and save files from GitHub, Dropbox, Google Drive and One Drive.
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1Writer
1Writer combines all the basic text editing features you would expect with all the advanced features you will ever need. Use 1Writer to write, research, revise, and share your ideas with maximum efficiency. 1Writer provides a distraction free writing environment. You can create and edit plain text or Markdown files. It does have many features including inline Markdown preview, word count, dark theme, TextExpander support, insert photo, an extra keyboard row, and many more. See the formatted results with inline Markdown preview while you write and a full, rich-text preview when you're done. Pick and choose existing Dropbox or WebDAV folders you want to sync or sync them all. Work offline and your changes will be synced next time you connect to the Internet. It also supports iCloud Drive - start a new document on your Mac and continue editing it in 1Writer, and vice versa. You can send text to 1Writer from Safari and other apps via the Share extension or 1Writer URL scheme.
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