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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Typora
Typora gives you a seamless experience as both a reader and a writer. It removes the preview window, mode switcher, syntax symbols of markdown source code, and all other unnecessary distractions. Instead, it provides a real live preview feature to help you concentrate on the content itself. Typora allows you to manage your files easily, providing both file tree panel and articles (file list) side panel, allows you to manage your files easily. Organize your files your way, including putting in sync services, like Dropbox or iCloud. Automatically see the Outline structure of your documents in outline panel, which allows you to quickly go through the document and jump to any section with one click. Export to PDF with bookmarks. Go further and export or import. More formats, including docx, OpenOffice, LaTeX, MediaWiki, Epub, etc, can be exported or imported. See how large your document is in words, characters, lines, or reading minutes.
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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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Bookdown
Write HTML, PDF, ePub, and Kindle books with R Markdown. The bookdown package is an open-source R package that facilitates writing books and long-form articles/reports with R Markdown. Generate printer-ready books and ebooks from R Markdown documents. A markup language easier to learn than LaTeX, and to write elements such as section headers, lists, quotes, figures, tables, and citations. Multiple choices of output formats: PDF, LaTeX, HTML, EPUB, and Word. Possibility of including dynamic graphics and interactive applications (HTML widgets and Shiny apps). Support a wide range of languages: R, C/C++, Python, Fortran, Julia, Shell scripts, and SQL, etc. LaTeX equations, theorems, and proofs work for all output formats. Can be published to GitHub, bookdown.org, and any web servers. Integrated with the RStudio IDE. One-click publishing to https://bookdown.org.
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