Website  URLPRDescription     https://adwords.google.com/select/KeywordToolExternal Google关键词建议与搜索量  http://freekeywords.wordtracker.com/ 关键词建议与搜索量  http://www.keyworddiscovery.com/search.html 关键词建议与搜索量  http://tools.seobook.com/keyword-tools/seobook/    http://www.google.com/trends/hottrends Google美国地区热门关键词  http://www.google.com/webhp?complete=1 Google关键词结果提示  https://account.uk.miva.com/advertiser/Account/Popups/KeywordGenBox.asp 查询相关关键词搜索情况以及建议  http://www.selfseo.com/keyword_suggestion_tool.php3关键词建议与分地区流行度  http://www.seochat.com/seo-tools/keyword-suggestions-google/3Keyword  Suggestions for Google  http://www.webmaster-toolkit.com/keyword-research-tool.shtml3Keyword  Research Tool  http://www.keyworddiscovery.com/keywords.html2Keyword  Discovery and Analyze  http://www.webconfs.com/website-keyword-suggestions.php    http://www.seochat.com/seo-tools/keyword-density/ Keyword  Density  http://tool.motoricerca.info/keyword-density.phtml Keyword  Density  http://www.ranks.nl/tools/spider.html5Keyword  Density  http://www.keyworddensity.com/search_engine_optimization/keyword_density.cgi2Keyword  Density  http://googlerankings.com/ultimate_seo_tool.php5Keyword  Density  http://www.webconfs.com/keyword-density-checker.php3Keyword  Density  http://tools.seobook.com/general/keyword-density/4Keyword  Density  http://www.webuildpages.com/seo-tools/keyword-density/index.php4Keyword  Density  http://www.semrush.com/4竞争分析  http://www.seochat.com/seo-tools/search-engine-keyword-position/ 搜索关键词位置http://www.google.cn/trends 谷歌趋势http://index.baidu.com/ 百度工具