Hi All, Here i listed important Keyword tools for SEO and webmasters, 1. Google Adwords Keyword tools : https://adwords.google.com/select/KeywordToolExternal 2. MSN Adcenter : https://adcenter.microsoft.com/research/KeywordResearch.aspx 3. Wordtracker free tool : http://freekeywords.wordtracker.com/ 4. Google Trends : http://www.google.com/trends 5. Twitter Trends : http://twist.flaptor.com/ 6. Google News Trends : http://news.google.com/archivesearch PPC Advertising : 1. Google adwords estimator : https://adwords.google.com/select/TrafficEstimatorSandbox 2. MSN Adcenter Keyword estimator : https://adcenter.microsoft.com/Research/KeywordEvaluate.aspx 3. SEMrush : http://www.semrush.com/