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.

PrepostSEO Guest Posting - Daily Updated (10-30 sites added daily)- Publish Guest Posts at high authority guest posting sites (blogs). All premium websites listed.

Plerdy - Plerdy is a comprehensive conversation rate optimization software that caters to professional online marketers and agencies, allow them to enhance website performance and increase revenue greatly.

Adsy - Adsy is a guest posting service offering advantages for publisher and buyers. Only quality sites DA40+

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.

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.