SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Screaming Frog SEO Spider - The Screaming Frog SEO Spider is a small desktop program (PC or Mac) which crawls websites’ links...
Lumar - (Previously DeepCrawl) Hosted SEO spider to analyze and find problems with websites.
Pulno - SEO Audit and Website Analysis. Pull up your SEO.
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.
SE Ranking - All-in-One cloud-based SEO software for agencies, marketing teams and webmasters