What are the must-have tools for SEO professionals?

[Harry P]

Do you guys know any tools that must have for SEO professionals, of course it needs to be safe for websites in search engines.
I would like both free and paid ones. Thanks

 

[elcidofaguy]

Do you guys know any tools that must have for SEO professionals, of course it needs to be safe for websites in search engines.
I would like both free and paid ones. Thanks

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As such I'm closing this thread as it is better for any additions/comments to be placed on one all encompassing thread than for it to be split...