Topvisor - All in one SEO and PPC tools for better marketing.
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.
Keyword Explorer by Moz - Find the best keywords to improve your website's SEO traffic
Google Trends - Explore Google trending search topics with Google Trends.
Nibbler - Free tool for testing how good your website is, and what you can do to improve it. Check accessibility, SEO, social media, compliance and more.
Keywords Everywhere - Free browser add-on for keyword volume, CPC & competition