Great tool to improve your blog posts.
Keyword Surfer - Get search volumes & keyword data directly in Google.
cognitiveSEO - The cognitiveSEO tool provides a unique analysis process that delivers Unparalleled Backlink Analysis, Content Audit and Rank Tracking for Every Site.
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Ubersuggest - Want more traffic? Ubersuggest shows you how to win the game of SEO. Just type in a domain or a keyword to get started.
Moz Pro - Moz Pro is a PRO version that offers a complete SEO toolset that improves search engine ranking and visibility.
ContentPro - Find articles from other companies to optimize your content