accessiBe - Making websites accessible to people with disabilities
Screaming Frog SEO Spider - The Screaming Frog SEO Spider is a small desktop program (PC or Mac) which crawls websites’ links...
tota11y - An accessibility visualization toolkit from Khan Academy
Sitechecker - All-in-one SEO platform including rank tracker, website SEO audit tool and website changes monitoring. Detailed reports by 100+ parameters with how-to-fix guides.
Page Speaker - Modern web accessibility tools for agencies & webmasters
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.