The best Typesetting System alternative to Markdown is Quarkdown, which is both free and Open Source. If that doesn't work for you, our users have ranked more than 10 alternatives to Markdown, but unfortunately only two of them are Typesetting Systems.
A modern Markdown system featuring advanced scripting, syntax extensions, and live preview, enabling seamless creation of complex books, articles, and interactive presentations, with flexible output to PDF, HTML, support for variables and community libraries.
LaTeX is a high-quality typesetting system; it includes features designed for the production of technical and scientific documentation.
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