SEO Site Checkup - Find comprehensive search engine optimization (SEO) tools for your site.
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Majestic - Majestic - Link intelligence tools for SEO and Internet PR and Marketing. Site Explorer shows inbound link and site summary data.
Moz - Backed by industry-leading data and the largest community of SEOs on the planet, Moz builds tools that make inbound marketing easy.
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.
SEO Analyzer By Neil Patel - A free SEO analyzer for your site