This page lists a few opinionated recommendations for Sphinx plugins to use in your documentation along with Furo. All these plugins work well with Furo-based Sphinx documentation, but they are not inherently tied to Furo.
MyST (Markedly Structured Text) : This project enables writing documentation with Markdown in Sphinx1. This is achieved by making well-thought-out extensions to the CommonMark Specification, which make it as capable as reStructuredText. In case you're wondering if that works well... this documentation is written using MyST.
Markdown is a significantly more popular markup format than reStructuredText. This means that it's likely that potential contributors/developers on the project are significantly more familiar with Markdown than reStructuredText. MyST gives you the best of both worlds -- simplicity and familiarity of Markdown with the extensibility power of reST.
sphinxext-opengraph : This project automagically adds Open Graph meta tags to your site's generated HTML. The Open Graph protocol is used by social media websites to determine how to present a page when a link is posted, and by search engines as a criterion toward ranking.
sphinx-inline-tabs : This project provides a straightforward way to introduce tabbed content within your documentation. This is useful for instructions specific to something about the end user (like their OS, or preferred language, etc). This is a great way to organise complex bits of documentation without major trouble.
Disclaimer: I am the creator and the primary maintainer of sphinx-inline-tabs.
sphinx-autobuild : This project provides a live-reloading server, that rebuilds the documentation and refreshes any open pages automatically when changes are saved. This enables a much shorter feedback loop which can help boost productivity when writing documentation. Furo's development workflow is based on uses this project.
Disclaimer: I am the primary maintainer of sphinx-autobuild.
sphinx-copybutton : This project adds a convenient copy button to code blocks. This is a subtle but effective user experience improvement when there are code snippets that a user might wish to copy from (examples, sample code etc).
In addition to the above, a shoutout to the Executable Books project which maintains many useful Sphinx extensions including some listed above.
Footnotes
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MyST addresses all the concerns that have been raised when arguing against Using Markdown for Technical Documentation, which really only leaves us with the good bits. :) ↩