White Magic Software, Ltd.
@White.Magic.Software

A free, open-source, cross-platform desktop Markdown text editor with live preview, string interpolation, math, and integration with a powerful TeX-based typesetting system. KeenWrite can produce high-quality PDF output, has text-based diagrams, supports custom annotations, has real-time document statistics, is internationalized, integrates the R programming language for dynamic documentation, and its multi-document tabbed interface can be rearranged as needed.