Soovle - Soovle is a customizable search engine provides the search suggestion of the best provider on the net.
Explore Keywords - Free keyword research tools
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 Spy - Get competitive data on other people's AdWords sem bids.
Google Trends - Explore Google trending search topics with Google Trends.
Moz Analytics - Moz Analytics is the most popular SEO (Search Engine Optimization) tool that uses both basic and advanced research tools to enhance your traffic.