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Search engine optimization (or SEO) is absolutely essential for any website’s success. But even when armed with an artillery of useful knowledge, your SEO campaign would never be complete without making use of tools that could help optimize your site, focus your efforts, and speed up the entire process.

After careful research, we’ve come up with 18 interesting free and commercial tools for SEO. The free ones we know you can’t lose out on; the commercial ones could be great choices but you’ll have to take a closer look and judge for yourself.