Zarget - Zarget is new age AB testing and Heatmap software that lets you optimize your website with just a few clicks thereby increasing sales.
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.
Growth Book - The Open Source A/B Testing Platform
Google Trends - Explore Google trending search topics with Google Trends.
ABTesting.ai - The tool allows you to exponentially increase the conversion rate in your Webpage, by automatically testing different variations of your landing page.
Keywords Everywhere - Free browser add-on for keyword volume, CPC & competition