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.
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.
Curatedseotools.com - Curated directory of the best SEO tools.
Keywords Everywhere - Free browser add-on for keyword volume, CPC & competition