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.
LeadBot by Drift - Qualify leads on your website without forms or humans
Google Trends - Explore Google trending search topics with Google Trends.
Google Analytics Lead Generator - Instantly get free leads from Google Analytics
Keywords Everywhere - Free browser add-on for keyword volume, CPC & competition
Sniply - Sniply is a content marketing tool providing social media conversion.