Soovle - Soovle is a customizable search engine provides the search suggestion of the best provider on the net.
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
KeywordTool.io - KeywordTool.io is the best FREE alternative to Google Keyword Planner and Ubersuggest. It uses Google's autocomplete feature to get over 750+ long-tail keywords for any given query.
Pro Rank Tracker - Rank tracking & reporting software solution
Google Trends - Explore Google trending search topics with Google Trends.
SE Ranking - All-in-One cloud-based SEO software for agencies, marketing teams and webmasters