SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
SEO Site Checkup - Find comprehensive search engine optimization (SEO) tools for your site.
Moz - Backed by industry-leading data and the largest community of SEOs on the planet, Moz builds tools that make inbound marketing easy.
Mangools - Juicy SEO tools you will love: Keyword research, SERP analysis, rank tracking, backlink analysis, website SEO analysis.
Serpstat - Search analytics, Rank tracking, Backlink analysis and Site Audit tool.
SEO Analyzer By Neil Patel - A free SEO analyzer for your site