aws.amazon.com
In short: AWS Marketplace (aws.amazon.com) accepts public saas listing. It is free to submit, takes a moderate amount of preparation, and scores 84/100 on our impact ranking (high impact).
Register as an AWS seller, integrate your tool subscription/billing, test it, and submit for launch.
Production-ready software, seller/KYC/tax setup, AWS billing integration, support, security, and review required.
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.