Internet Indexer - InternetIndexer.com is a bundled collection of best seo tools.
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Serpstat - Search analytics, Rank tracking, Backlink analysis and Site Audit tool.
Moz - Backed by industry-leading data and the largest community of SEOs on the planet, Moz builds tools that make inbound marketing easy.
SEOmator - SEO website analysis & audit tool
Marketing Miner - SEO tool for data-driven marketers