Site Audit by Ahrefs - Cloud based website analysis for 100+ SEO issues
SEOtooList - Find the best SEO tool for the right job (community curated)
AND CO - AND CO helps freelancers, entrepreneurs and other small businesses run their business smarter.
Mobile First Index Checker - mobile first indexing, mfi, seo, mobile, google
AND CO Desktop App - A free app to track time, tasks, and run a freelance career.
ContentKing - The world's only Real-time SEO Auditing and Content Change Tracking suite.