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huggingface.co
In short: Hugging Face Spaces (huggingface.co) accepts public interactive app and profile listing. It is free + paid tier to submit, takes only a few minutes, and scores 83/100 on our impact ranking (high impact).
Publish a useful public demo of an your tool AI or data feature as a Space with a detailed card and official project link.
Use a legitimate interactive app, respect licenses and data rules, and do not host irrelevant or abusive content.
Priority is high, which sets the band. It is free + paid tier and quick to complete, which adjusts it within that band. The score ranks your queue — it is not a measure of domain authority.