hubspot.com
In short: HubSpot App Marketplace (hubspot.com) accepts public hubspot app listing. It is free to submit, takes a moderate amount of preparation, and scores 84/100 on our impact ranking (high impact).
Build a public your tool HubSpot app using OAuth and submit its listing.
Requires a real public app, required installs/testing, listing assets, and manual review.
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.