Pandoc is a conversion program which understands a large amount of formats. Markdown, ODT, HTML, EPUB, man, LaTeX, and many more are available for conversion to and from, with even more available for just translation to. Pandoc can also encode metadata and create bibliographies.
Website 🔗️: https://pandoc.org/
apt 📦️: pandoc
Fosstodon is a Mastodon instance that is open to anyone who is interested in technology; particularly free & open source software.