SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Screaming Frog - Screaming Frog is search engine marketing agency offering search engine optimisation and pay-per-click advertising services.
SEOmator - SEO website analysis & audit tool
Pro Rank Tracker - Rank tracking & reporting software solution
Rank Tracker - Rank Tracker is an SEO tool for tracking and improving keyword rankings across multiple websites and search engines.
Lumar - (Previously DeepCrawl) Hosted SEO spider to analyze and find problems with websites.