Content Strategy Tools - 7 steps and tools to create a content marketing strategy
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.
Content Idea Generator - Free tool creates ideas for your content marketing strategy
Google Trends - Explore Google trending search topics with Google Trends.
SeoReviewTools Content Idea Generator - Use the Free Content Idea Generator to help you to come up with new content ideas related to your topic. Just enter your subject and this tool generates a list of approximately 100 headlines.
Keywords Everywhere - Free browser add-on for keyword volume, CPC & competition