PrePostSEO Domain Authority Checker - DA PA Checker (Domain Authority Checker) is developed to check bulk DA PA with spam score & IP Address for up to 500 URLs at once.
Accessily - Guest Posts Marketplace - A marketing platform for your articles and guest posts 📝📈
Checkbot - Checkbot will boost the SEO, speed and security of your site by checking you're following 50+ web best practices. Browser extension with free and paid plans.
Ahrefs Backlink Checker - With the world's biggest index of live backlinks (over 15 trillion), Ahrefs Backlink Checker will show you the most complete backlink profile for any website.
Adsy - Adsy is a guest posting service offering advantages for publisher and buyers. Only quality sites DA40+
Seobility - Seobility allows you to quickly audit and review a website from an onsite SEO perspective.