http://wordtrackerkeywords.net/ 关键词搜索量查询网站

http://freekeywords.wordtracker.com

https://adwords.google.com/select/KeywordToolExternal google的查询

http://www.link-assistant.com/seo-spyglass/download.html spyglass分析链接软件

http://siteexplorer.search.yahoo.com/search?p=http%3A%2F%2Fwww.premiumpearl.com&bwm=i&bwmo=s&bwmf=u 外链查询

http://www.copyscape.com 查询是否有原创效果

http://www.soloseo.com/tools/

外链查询相关工具:
http://www.online-utility.org/we … domain_analyzer.jsp

https://addons.mozilla.org/zh-CN/firefox/addon/5687

http://web.archive.org/web/*/http://domin.com  网站历史查询