Google Adwords 关键词工具:https://adwords.google.com/select/KeywordToolExternal
Google指数:http://www.google.cn/trends
Google热榜:http://www.google.cn/rebang/home
百度指数:http://index.baidu.com/
Google搜索解析:http://www.google.com/insights/search/#
Google Adplanner:https://www.google.com/adplanner/
百度指数:http://index.baidu.com/
百度搜索排行榜:http://top.baidu.com/
追词:http://www.zhuici.com/
新浪的关键词查询:http://chaxun.sina.com.cn/
MSN Keyword Forecast:http://adlab.msn.com/Keyword-Forecast/
WordTracker:http://www.wordtracker.com/
KeywordDiscovery:http://www.keyworddiscovery.com/
搜狗热搜榜:http://top.sogou.com/
搜搜龙虎榜:http://www.soso.com/lhb/s_i_sosolhb.shtml