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trello.com
In short: Trello Power-Up Directory (trello.com) accepts public power-up listing. It is free to submit, takes a moderate amount of preparation, and scores 66/100 on our impact ranking (useful).
Build an your tool Trello Power-Up, register it, sign the developer agreement, and submit it.
Requires polished Trello-specific functionality, reliable hosting, privacy/support details, and review of two or more weeks.
Priority is medium, 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.