The best alternatives to nicedoc are Docusaurus, ThinkJS, and snazzydocs. If these 3 options don't work for you, we've listed a few more alternatives below.
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Full-featured: plugins, themes, search, blog, versioning, i18n, React...
SpectaQL is an open-source static documentation generator for your GraphQL API. Give SpectaQL your GraphQL endpoint or schema file and it will generate HTML and CSS for a static, single-page site. Designed to be themeable and extremely customizable.