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ko-fi.com
In short: Ko-fi (ko-fi.com) accepts creator page link. It is free + paid tier to submit, takes a moderate amount of preparation, and scores 43/100 on our impact ranking (long tail).
Create support page linking your tool.
Support/referral; not core SEO.
Priority is later, 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.