Here is a list of some of the best free SEO tools available:

* **Google Search Console:** This tool from Google provides you with data about your website's search traffic and performance. You can use it to identify issues with your website that are affecting your search rankings, as well as to track your progress over time.
* **Google Analytics:** This tool from Google tracks your website traffic and provides you with data about your visitors. You can use it to understand who your visitors are, where they are coming from, and what they are doing on your site.
* **Ahrefs Webmaster Tools:** This tool from Ahrefs provides you with data about your website's backlinks. You can use it to identify websites that are linking to you, as well as to track your progress over time.
* **Moz Local:** This tool from Moz helps you to optimize your website for local search. You can use it to create and manage your listings in local directories, as well as to track your website's performance in local search results.
* **SEMrush:** This tool from SEMrush provides you with data about your website's organic and paid search traffic. You can use it to identify your competitors, as well as to track your progress over time.
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* **Keyword Surfer:** This browser extension from Surfer SEO helps you to optimize your website's content for search engines. It provides you with real-time feedback on your content, as well as suggestions for how to improve it.
* **Google Trends:** This tool from Google shows you how often certain keywords are being searched for over time. You can use it to identify trending keywords, as well as to track the popularity of your own keywords.
* **Yoast SEO:** This plugin for WordPress helps you to optimize your website's content for search engines. It provides you with a checklist of things to do to improve your SEO, as well as suggestions for how to improve your content.
* **RankMath:** This plugin for WordPress is another great option for optimizing your website for search engines. It is similar to Yoast SEO, but it offers a few more features.