Ahrefs - Ahrefs is a toolset for SEO and marketing. We have tools for backlink research, organic traffic research, keyword research, content marketing & more. Give Ahrefs a try!
Moz - Backed by industry-leading data and the largest community of SEOs on the planet, Moz builds tools that make inbound marketing easy.
SEO PowerSuite - Get all SEO tools in one pack - download free edition of SEO PowerSuite and get top 10 rankings for your site on Google and other search engines!
SE Ranking - All-in-One cloud-based SEO software for agencies, marketing teams and webmasters
SEO Tools Centre - SEO Tools Centre provides SEO checker services for websites.
Mondovo - Mondovo is an all-in-one digital marketing platform for measuring & managing SEO and social media analytics.