SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
DemandSphere - DemandSphere is an advanced-level software that helps marketers to create the best digital appearances of their brands.
Moz - Backed by industry-leading data and the largest community of SEOs on the planet, Moz builds tools that make inbound marketing easy.
PPC Keyword - PPC campaign building and management
SEOquake - SEOquake provides a browser extension to conduct on-page SEO audit.
Serpstat - Search analytics, Rank tracking, Backlink analysis and Site Audit tool.