There are a number of free backlink tools available online that can help you analyze your backlinks and improve your SEO strategy. Here are a few options:

1. Google Search Console: This is a free tool provided by Google that allows you to see which websites are linking to your site, as well as other important SEO metrics like your site's search performance, indexing status, and more.

2. Ahrefs Backlink Checker: Ahrefs is a popular SEO tool that offers a free backlink checker. This tool allows you to see your website's backlink profile, including the number of backlinks, referring domains, and more.

3. Moz Link Explorer: Moz is another popular SEO tool that offers a free backlink checker. Moz's Link Explorer allows you to see your website's backlink profile, as well as important metrics like domain authority and page authority.

4. SEMrush Backlink Checker: SEMrush is an all-in-one SEO tool that offers a free backlink checker. This tool allows you to see your website's backlink profile, as well as other important SEO metrics like organic search traffic, keyword rankings, and more.

It's important to keep in mind that while these free tools can provide helpful insights into your backlink profile, they may have limitations compared to paid tools. Additionally, these tools may not provide a complete picture of your backlink profile, so it's important to use them in conjunction with other SEO strategies to build a strong backlink profile.