Cleverstat Backlinks Checker - CleverStat Free Backlink Checker provides accurate and up to date information about backlinks including URL, anchor text, trust rank, number and quality of links.
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.
WebsiteSEOChecker Long Tail Keyword Research - Free and no limit tool to generate long tail keywords. just enter the seed keywords and get unlimited long tail keywords. the first step in SEO.
Backlinks by Neil Patel - A backlinks research tool for competitive intelligence
Seobility - Seobility allows you to quickly audit and review a website from an onsite SEO perspective.
Toxic Backlink Checker - Find out what's lurking in your backlink profile.