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observablehq.com
In short: Observable (observablehq.com) accepts public notebook or data-app page. It is free to submit, takes a moderate amount of preparation, and scores 84/100 on our impact ranking (high impact).
Publish a genuinely useful your tool data visualization, audit demo or explainer notebook and make it publicly indexable.
Set public access to Can view for indexing; provide original analysis and never expose secrets or private datasets.
Priority is high, which sets the band. It is free and moderate to complete, which adjusts it within that band. The score ranks your queue — it is not a measure of domain authority.