SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Pro Rank Tracker - Rank tracking & reporting software solution
SEOquake - SEOquake provides a browser extension to conduct on-page SEO audit.
SE Ranking - All-in-One cloud-based SEO software for agencies, marketing teams and webmasters
SEOmator - SEO website analysis & audit tool
Lumar - (Previously DeepCrawl) Hosted SEO spider to analyze and find problems with websites.