SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Searchmetrics - Searchmetrics Suite for enterprise companies provides SEO marketing and analytics, SEO optimization, social and content marketing.
SEOmator - SEO website analysis & audit tool
Moz - Backed by industry-leading data and the largest community of SEOs on the planet, Moz builds tools that make inbound marketing easy.
SEOquake - SEOquake provides a browser extension to conduct on-page SEO audit.
Dragon Metrics - Dragon Metrics is an SEO platform offering rank tracking, onsite optimization, link management, keyword research tools, & more