SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Hobo-web - Hobo-web is an all the in search engine optimization service that is intended for online businesses and eCommerce store owners to enhance their visibility and extract the right potential to get things done in a productive manner.
Lumar - (Previously DeepCrawl) Hosted SEO spider to analyze and find problems with websites.
TopRank - TopRank is a digital advertising agency that provides best-in-class services in SEO, PPC, Social Media Marketing, Pay-Per-Click Advertising, Lead Generation, Email Marketing, Inbound Marketing, Web Design/Development, and Digital PR.
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 - Backed by industry-leading data and the largest community of SEOs on the planet, Moz builds tools that make inbound marketing easy.