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.
Keyworddit - Keyworddit is a popular platform that can help you to raise your SEO game in a smooth and convenient way.
Google Trends - Explore Google trending search topics with Google Trends.
Keyword Surfer - Get search volumes & keyword data directly in Google.
Keywords Everywhere - Free browser add-on for keyword volume, CPC & competition
Keyword Discovery - Keyword Discovery is a keyword research and analysis tool.