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readthedocs.org
In short: Read the Docs (readthedocs.org) accepts public versioned documentation project. It is free + paid tier to submit, takes a moderate amount of preparation, and scores 95/100 on our impact ranking (highest impact).
Import public your tool developer documentation, add the build config and expose versioned, searchable docs with canonical project links.
Community hosting expects a public repository and genuine documentation; configure canonical URLs to avoid duplicate-content issues.
Priority is do first, which sets the band. It is free + paid tier and moderate to complete, which adjusts it within that band. The score ranks your queue — it is not a measure of domain authority.