Recombee - Recommender system as a service that uses advanced Machine Learning and Artificial Intelligence algorithms. Easy to try and evaluate.
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.
Reddit List - Tracking the top 5000 subreddits
Google Trends - Explore Google trending search topics with Google Trends.
reddit shell - Web-based shell for browsing reddit (pretend you're working)
Keywords Everywhere - Free browser add-on for keyword volume, CPC & competition