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2. sphinx-notfound-page: is great to create a "Not found" (or 404) page to show when the reader hit a not found page: https://sphinx-notfound-page.readthedocs.io
3. sphinx-hoverxref: adds amazing tooltips on your cross-references that points to another page/section of the documentation including its content on the tooltip: https://sphinx-hoverxref.readthedocs.io
#python