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I wrote up a few open systems in asciidoctor, which can seamlessly be used to produce PDFs, web pages, ebooks, and docbook markup for physical books. Firmly believe that that is the way to go when authoring open RPGs. Pandoc-flavoured markdown is ok; the markup isn't as consistently-designed but it has more backends available. Note that pandoc has some support for both LaTeX and asciidoctor so really anything that has good pandoc support is nice.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.