This is top 10 keyword research tool in the world. It is very helpful for your website SEO.
- https://adwords.google.com/select/KeywordToolExternal
- http://www.google.com/sktool/
- http://tools.seobook.com/keyword-list/generator.php
- http://freekeywords.wordtracker.com/
- http://www.goodkeywords.com/good-keywords/
- http://www.google.com/insights/search/
- http://www.seomoz.org/popular-searches/index/2010-07-16
- http://webconfs.com/keyword-playground.php
- http://www.keyworddiscovery.com/search.html
- http://www.google.com/trends
- http://www.nichebotclassic.com/
