21款关键词研究工具（Keyword Research Tool）分享，大部分免费

1. Google Keyword Tool (Free)

最大众化而且免费，深受广大群众欢迎。

http://adwords.google.com/select/KeywordToolExternal

2. KeywordSpy.com (Paid $89.95 a month)

http://www.keywordspy.com

3. Good Keywords (Free and Paid version)

http://www.goodkeywords.com

4. Traffic Travis (Free and Paid Version)

http://www.traffictravis.com

5. SEO Book Keyword Suggestion Tool (Free)

http://tools.seobook.com/keyword-tools/seobook/

6.KeywordDiscovery.com ($49.95 per month)

http://www.keyworddiscovery.com

7. WordPot.com (Free and Paid Version)

http://www.wordpot.com

8. Wordtracker.com

http://www.wordtracker.com

9. KeywordElite.com ($174 one-time cost)

http://www.keywordelite.com

10. KWBrowse.com (Free)

http://www.kwbrowse.com

11. Quintura.com (Free)

http://www.quintura.com

12. SpyFu.com (Free and Paid version)

http://www.spyfu.com

13. WordButler (Free trial then $19.95/month)

http://www.wordbutler.com

14. AdCenter Labs (Free)

http://adlab.msn.com

15. Nichebot.com

http://www.nichebot.com

16. Spacky.com (Free)

http://www.spacky.com

17. Google Insights (Free)

http://www.google.com/insights/search/

18. TheDowser.com (Free and Paid Version)

http://www.thedowser.com

19. KeywordExtend.com (Free)

http://www.keywordextend.com

20. GoRank (Free)

http://www.gorank.com/analyze.php

21. Trellian

http://ci.trellian.com/index.html

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