Docusaurus

The default for open-source docs, largely by being there first.

What it is sold for

Publishing versioned project documentation.

Same shelf

The rest of docs and content, alphabetically. Sharing a category is a filing decision, not a relationship.

• Apidog
  API design, mocking, testing and documentation in one desktop tool, generated from requests you have already made.
• Bump.sh
  Publishes API documentation from OpenAPI, with change detection between versions and MCP servers generated alongside.
• Contentful
  A headless CMS built for many channels at once, now positioning content as something agents consume as well as browsers.
• DatoCMS
  A headless CMS with a strong editorial interface and a GraphQL API built for performance budgets.
• DeveloperHub
  Hosted documentation for product docs, knowledge bases and API reference.
• DiagramGPT (Eraser)
  Generates architecture and sequence diagrams from a text description, from the Eraser team.
• DocuWriter.ai
  Generates structured documentation for a whole codebase from the repository itself.
• Fern
  Generates SDKs and documentation from an API specification, so client libraries are output rather than maintenance.

All 31 in docs and content