Below is a list of free keyword research tools I have been using this year. Let me know if I missed anything worthwhile.
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6 Free Keyword Research Tools
Google’s tool that allows you to preview unbiased organic rankings and paid search ads per any given keyword and geography. Use for checking keyword rankings. When you search on Google.com you will see search results personalized to you so you need to use this tool to figure out how the first page on Google really looks like for the user.
Allows you to identify keywords to target based on actual search volume to make sure you are including the keywords your customers are actually searching for in your SEO strategy. In addition, this tool will help you discover additional keywords related to your original word or phrase. Use for keyword research, discovery, and content creation ideas.
Formerly Insights for Search. Shows you what is trending online and what people are searching for. Use for identifying trending keywords and to validate your keyword strategy. For example, you may be better of targeting low-volume, less-competitive keyword that is trending hot and is a long-term investment.
Get keyword ideas with Übersuggest, the free keyword suggestion tool that makes good use of Google Suggest and other suggest services. You can choose a language and Übersuggest can get suggestions either from regular Web search or from search verticals like Shopping, News or Video. It is a great tool for vertical and multilingual keyword research.
Provides you with insights on how competing sites are performing in search. SEM Rush has a great dashboard functionality and combines couple different data sources in one place. Use to check how competitors are ranking on keywords.