This is a new free and open-source alternative to the most popular WordPress SEO plugins…
This is the open-source and free SEO Plugin For WordPress. The plugin is simple to use and packs all the important features.
You can find screenshots and more information at homepage.
Open WordPress SEO is a comprehensive tool for all your SEO needs.
By using Open WordPress SEO search engines find your pages more easily, index your posts faster, and rank your site higher.
You can contribute to development in GitHub.