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.
Pro Rank Tracker - Rank tracking & reporting software solution
SEOmator - SEO website analysis & audit tool
SE Ranking - All-in-One cloud-based SEO software for agencies, marketing teams and webmasters
Lumar - (Previously DeepCrawl) Hosted SEO spider to analyze and find problems with websites.