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carrd.co
In short: Carrd (carrd.co) accepts public landing page. It is free + paid tier to submit, takes a moderate amount of preparation, and scores 43/100 on our impact ranking (long tail).
Make mini landing page for your tool categories linking home/tools.
Avoid doorway spam; make useful.
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.