Ubersuggest - Want more traffic? Ubersuggest shows you how to win the game of SEO. Just type in a domain or a keyword to get started.
Ahrefs Backlink Checker - With the world's biggest index of live backlinks (over 15 trillion), Ahrefs Backlink Checker will show you the most complete backlink profile for any website.
Curatedseotools.com - Curated directory of the best SEO tools.
Backlinks by Neil Patel - A backlinks research tool for competitive intelligence
Respona - Build quality backlinks and take your website’s organic traffic to new heights with Respona.
SEMScoop - Find and analyze easy to rank long-tail keywords with free SEMScoop Keyword Difficulty Tool, Start using them for SEO, PPC, content creation and all your marketing activities