Best (and free) Backlink Analysis tool

@Morgan is there a good (and free) online backlinks analysis tool that I can use to find what sites link to my site and the authority score of those links? I had an SEO consultant run this for me back when I was in another industry and it really helped to understand my backlink strategy performance.

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I promotion my website by using SEO, and I see that one of the best tool Ahrefs. But it is`n free(