DemandSphere - DemandSphere is an advanced-level software that helps marketers to create the best digital appearances of their brands.
SerpWatch - Track your rankings with a fast and 100% accurate rank checker. Manage multiple locations and projects with full app integration. Try it for free for 15 days.
DataForSEO - DataForSEO offers API data for SEO companies that deliver results of tasks for Rank tracking, SERP, Keyword data and On-page APIs.
SEOmator - SEO website analysis & audit tool
Searchmetrics Suite - SEO Software
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.