Link Research Tools - Recover, Protect, Learn and Grow your SEO with LRT.
Searchmetrics - Searchmetrics Suite for enterprise companies provides SEO marketing and analytics, SEO optimization, social and content marketing.
MegaIndex - Use MegaIndex to identify your inbound link profile and boost your linkbuilding strategy. View social activity, research backlinks, identify competitors, and analyze anchor text.
Moz - Backed by industry-leading data and the largest community of SEOs on the planet, Moz builds tools that make inbound marketing easy.
Ryte - Ryte is a web-based software invented for technical optimization for search engines and improvement of websites.
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!