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 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.
Backlinks by Neil Patel - A backlinks research tool for competitive intelligence
Semrush Authority Score Explained - Find out how Semrush Authority Score may help you to get better at your link building efforts when looking for quality domains, and improving your own website‘s authority.
SEMScoop - Find and analyze easy to rank long-tail keywords with free SEMScoop Keyword Difficulty Tool, Start using them for SEO, PPC, content creation and all your marketing activities
SmallSEOTools Google Cache Checker - Google Cache checker is an online tool to view cached pages, Enter any website URL to find when was the last time your web page was cached.