Ahrefs
Ahrefs is an SEO software suite that contains tools for link building, keyword research, competitor analysis, rank tracking and site audits. Ahrefs database has over 11 billion keywords and more than 400 billion indexed pages which helps it provide maximum data accuracy to its users.
Semrush
Semrush is an all-in-one tool suite for improving online visibility and discovering marketing insights. Their tools and reports are able to help marketers that work in the following services: SEO, PPC, SMM, Keyword Research, Competitive Research, PR, Content Marketing, Marketing Insights, Campaign Management.
Serpstat
A feature-rich software that fulfils all your SEO needs and takes your business to an all new level. Serpstat offers a wide variety of tools and features that include Keyword Research, Search Analytics, Advertising Analysis, Rank Tracking, etc.
Moz
SEOmoz is the world's most popular provider of SEO software. Their easy to use tools and tutorials make search engine optimization accessible to everyone.
Clearscope
Clearscope is the best-in-class SEO content optimization platform that drives search traffic. Our streamlined tools simplify SEO writing so you create first-rate content that ranks.
Searchmetrics
SearchMetrics is a comprehensive SEO and content marketing suite for enterprises that allow them to create engaging content and connect with customers in a more effective way. The SEO and Content Experience suite aims to eliminate guess work from the equation by providing deep insights into the market and competitors.
BrightEdge
BrightEdge platform combines SEO and business metrics into one-click reports, provides actionable recommendations on the best opportunities to gain share of organic search traffic, enabling SEO managers and experts to focus their efforts for maximum impact.
SE Ranking
SE Ranking is an all-inclusive cloud-based SEO and web-based marketing platform trusted by over 12000 SMEs and 4000 agencies worldwide. It offers a wide array of SEO tools that most experts will likely use to achieve SEO-optimized websites, including keyword suggestion, website ranking, competitor analysis, SEO audit, etc.