SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Soovle - Soovle is a customizable search engine provides the search suggestion of the best provider on the net.
Ahrefs - Ahrefs is a toolset for SEO and marketing. We have tools for backlink research, organic traffic research, keyword research, content marketing & more. Give Ahrefs a try!
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.
SE Ranking - All-in-One cloud-based SEO software for agencies, marketing teams and webmasters
Google Trends - Explore Google trending search topics with Google Trends.