salesforce.com
In short: Salesforce AppExchange (salesforce.com) accepts public salesforce solution listing. It is free + paid tier to submit, takes a moderate amount of preparation, and scores 81/100 on our impact ranking (high impact).
Build or package an your tool Salesforce solution and create its listing in the Publishing Console.
Must pass Salesforce security review and supply legal, support, demo, and listing materials.
Priority is high, 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.