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pandoc is a converter between many text markup formats. It is written in /Haskell but many uses even don't know that - they just use a statically linked binary or a system package. I think it is a good example of well-made software.
Pandoc can parse your /Markdown file and produce a chunk of HTML, a standalone HTML page, or even a PDF document. It can highlight code examples, "render" LaTeX formulas, do many other text related kinds of work. As the official page says, "pandoc is your swiss-army knife". Even /gitit renders this Wiki using pandoc!
/Emacs users can process their Org mode files with ox-pandoc . Also, one can run pandoc as a /Docker container: there is a plenty of images.
One neat feature of pandoc is filter support. Pandoc filters are small programs that read an AST of the input document, transform it, and produce the resulting AST. Usually, filters work with JSON, but one can have the access to more convenient representations if he will write the filter in
- /Haskell with pandoc as a library
- /Python with panflute package