SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Internet Indexer - InternetIndexer.com is a bundled collection of best seo tools.
Ahrefs - Ahrefs is a toolset for SEO and marketing. We have tools for backlink research, organic traffic research, keyword research, content marketing & more. Give Ahrefs a try!
Moz - Backed by industry-leading data and the largest community of SEOs on the planet, Moz builds tools that make inbound marketing easy.
RankWatch - RankWatch is an offering cloud centric SEO management solutions.
Serpstat - Search analytics, Rank tracking, Backlink analysis and Site Audit tool.