SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
cognitiveSEO - The cognitiveSEO tool provides a unique analysis process that delivers Unparalleled Backlink Analysis, Content Audit and Rank Tracking for Every Site.
Lumar - (Previously DeepCrawl) Hosted SEO spider to analyze and find problems with websites.
Ubersuggest - Want more traffic? Ubersuggest shows you how to win the game of SEO. Just type in a domain or a keyword to get started.
Website Checker Tech - WebsiteChecker.Tech is SaaS tool that detects SEO and availability issues of your website, making it easier for you to fix them.
Moz Pro - Moz Pro is a PRO version that offers a complete SEO toolset that improves search engine ranking and visibility.