Serpstat - Search analytics, Rank tracking, Backlink analysis and Site Audit tool.
iBusinessPromoter - IBP is a popular search engine optimization software with a ranking guarantee. If you are interested in SEO and website promotion, visit this page.
SE Ranking - All-in-One cloud-based SEO software for agencies, marketing teams and webmasters
Advanced Web Ranking - Advanced Web Ranking (AWR) is a robust rank tracker, specially designed for large amounts of keywords, which makes it the ideal solution for agencies and medium-to-large in-house teams.
RankHacker.com - The only keyword research tool that forecasts ROI & automates your content strategy.
DataForSEO - DataForSEO offers API data for SEO companies that deliver results of tasks for Rank tracking, SERP, Keyword data and On-page APIs.