swiftpackageindex.com
In short: Getting listed on Swift Package Index is free. Plan for about 45 minutes — there is material to prepare and a review to wait on.
What they ask for: Add a public Swift package with Package.swift, semantic-version tags, documentation and your homepage link.
Add a public Swift package with Package.swift, semantic-version tags, documentation and your homepage link.
Repository must be public, use Swift 5 or newer and have a valid semantic-version release.
Open the submission page on swiftpackageindex.com and complete its form — that is the "Open submit page" link at the top of this page.
Repository must be public, use Swift 5 or newer and have a valid semantic-version release.
Priority sets the band — this one is high. Cost (free) and effort (moderate) move it within that band, which puts it in the high impact tier. The score orders a submission queue. It is not a measure of the site’s domain authority, traffic or quality.