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rubygems.org
In short: RubyGems.org (rubygems.org) accepts published ruby gem page. It is free to submit, takes a moderate amount of preparation, and scores 84/100 on our impact ranking (high impact).
Package a legitimate your tool Ruby client or utility and add homepage and source metadata before pushing the gem.
Use a unique gem name, valid gemspec and maintained code; never publish a placeholder package.
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.