Google AdWords Keyword PlannerGoogle AdWords Keyword Planner is a keyword research tool that allows you to find the right keywords to target for display ads, search ads, video ads, and app ads.
Obviously this is the one of the strongest tools out there. It gives a full analysis of potential keywords. We find it is best to use other Keyword Finders, such as WordStream, take the keywords they recommend, and drop them in Google Keyword Planner to really help with filtering.
WordStream: Free Keyword Tools from WordStreamWordStream offers a suite of free keyword tools for keyword suggestion, keyword grouping and negative keyword research for PPC and SEO.
WordStream also offers a collection of other top resources for taking your PPC and SEO accounts to the next level.
Google TrendsSee the latest trends, data and visualizations from Google. Find out what's trending near you right now. This tool is great to test out words and see how their usage is trending across the internet. It is a great place to test questions like, should I be saying 'AdWords,' or 'PPC.'