Groff is described as 'The groff (GNU troff) software is a typesetting package which reads plain text mixed with formatting commands and produces formatted output' and is a typesetting system in the education & reference category. There are nine alternatives to Groff for a variety of platforms, including Linux, Mac, Windows, BSD and Self-Hosted apps. The best Groff alternative is LaTeX, which is both free and Open Source. Other great apps like Groff are Typst, SILE, Pollen and Tectonic typesetting.
LaTeX is a high-quality typesetting system; it includes features designed for the production of technical and scientific documentation.
LaTeX is the most popular Windows, Mac & Linux alternative to Groff.
LaTeX is the most popular Open Source & free alternative to Groff.
Typst is a new markup-based typesetting system for the sciences. It has got instant previews, easy-to-learn markup and supercharged templates. Its collaborative web app makes working in a research group or student team a breeze.
Typst is the most popular Web-based alternative to Groff.
SILE is a typesetting system inspired by TeX and InDesign, but seeks to be more flexible, extensible and programmable than them.
Pollen is a publishing system that helps authors create beautiful and functional web-based books. Pollen includes tools for writing, designing, programming, testing, and publishing.
Tectonic typesetting is the most popular Self-Hosted alternative to Groff.
DocBook is a schema (available in several languages including RELAX NG, SGML and XML DTDs, and W3C XML Schema) maintained by the DocBook Technical Committee of OASIS. It is particularly well suited to books and papers about computer hardware and software (though it is by no...
“a system for typesetting documents based on TEX and METAPOST. You can use this system for converting documents coded in TEX format as well as documents coded in XML into high quality PDF” (http://www.pragma-ade.nl/)
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It is also very good for professional documents and technical writing, It is more verbose and syntax heavy but there is more information available for it online. it is also much more flexible due to the large amount of packages available.