第一部分：关键词工具

*关键词研究工具*：适当深入地进行关键字研究,为你的网站进行栏目划分及规范关键词部署做准备。
 1. Keyword Research Tool - Webmaster
toolkit<http://www.webmaster-toolkit.com/keyword-research-tool.shtml>
2. Keyword External Tool - Google
Adwords<https://adwords.google.com/select/KeywordToolExternal>
3. Keyword Selector Tool - Inventory
Overture<http://inventory.overture.com/d/searchinventory/suggestion/>
4. Keyword Suggestions Overture - SEO
Chat<http://www.seochat.com/seo-tools/keyword-suggestions-overture/>
5. Website Keyword Suggestions - Webconfs
<http://www.webconfs.com/website-keyword-suggestions.php>  6. Keyword
Suggestion Tool - Self SEO<http://www.selfseo.com/keyword_suggestion_tool.php>

*关键词密度*：一个关键字、词在页面出现的个数及所占文本的比率。
 7. Keyword Density - SEO
Chat<http://www.seochat.com/seo-tools/keyword-density/>
8. Keyword Density & Proeminence - Ranks
<http://www.ranks.nl/tools/spider.html>  9. Keyword Density Analyzer -
Keyword density <http://www.keyworddensity.com/>  10. Analyze Keywords
Density - Google rankings <http://googlerankings.com/ultimate_seo_tool.php>
11. Keyword Density Checker -
Webconfs<http://www.webconfs.com/keyword-density-checker.php>
12. Keyword Density Analyzer Tools - SEO
Book<http://tools.seobook.com/general/keyword-density/>

*竞争对手分析*:可以分析目标关键词的竞争对手是谁，并分析竞争对手用过的关键词。
 13. Competition Tool - SEO Digger <http://seodigger.com/>  14. Competition
Analysis Tool - Seoscorecard <http://www.seoscorecard.com/>  15. Top
Competitor Tool -
Webuildpages<http://www.webuildpages.com/seo-tools/top-competitor-tool.php>

*搜索引擎关键字位置的工具*:利用这些工具来检查你的关键词目前在主要搜索引擎如Google, Yahoo, MSN所处的位置。
 16. Search Engine Keyword Position - SEO
Chat<http://www.seochat.com/seo-tools/search-engine-keyword-position/>
17. Keyword Analysis Tool -
Mcdar<http://www.mcdar.net/KeywordTool/keywordtool.asp>
18. SERPS Position Checker - LinkVendor
<http://www.linkvendor.com/seo-tools/serps-position.html>  19. Website
Position Tool - Rnk1 <http://www.rnk1.com/>

第二部分：链接工具

*链接广度*：跟踪反向链接的总数，并返回哪些网站链回了你及锚文本是哪些。
 20. Link Popularity - SEO
Chat<http://www.seochat.com/seo-tools/link-popularity/>
21. Link Popularity Checker - Webmaster Toolkit
<http://www.webmaster-toolkit.com/link-popularity-checker.shtml>  22. Link
Popularity Check - Widexl Internet
Solution<http://www.widexl.com/remote/link-popularity/index.html>
23. Link Popularity Check - Market Leap
<http://www.marketleap.com/publinkpop/>  24. Link Popularity - Backlinks
Checker - Search Bliss <http://www.searchbliss.com/seo-tools/popularity.asp>
25. Backlink Analyzer - Sitening
<http://sitening.com/seo-tools/backlink-analyzer/my-analyzer/>  26. Check
Backlinks - Webuildpages <http://www.webuildpages.com/neat-o/>

*C级IP地址检查:*：对链接伙伴进行IP地址分布检查，而不至于被同一类IP地址的链接所惩罚。
 27. Class C Checker - Webrank Info
<http://www.webrankinfo.com/english/tools/class-c-checker.php>  28. Class C
Checker - Webmaster
Toolkit<http://www.webmaster-toolkit.com/class-c-checker.shtml>
29. Class C Checker - SEO
Chat<http://www.seochat.com/seo-tools/class-c-checker/>

*蜘蛛模拟器*：可以获知网页外观与搜索引擎蜘蛛索引的区别。
 30. Spider Simulator - SEO
Chat<http://www.seochat.com/seo-tools/spider-simulator/>
31. Spider View - Iwebtool <http://www.iwebtool.com/spider_view>  32. Search
Engine Spider Simulator - Anownsite
<http://www.anownsite.com/webmaster-resources/search-engine-spider-sim...>
33. SE Bot Simulator - XML
Sitemaps<http://www.xml-sitemaps.com/se-bot-simulator.html>
34. SE Spider - LinkVendor<http://www.linkvendor.com/seo-tools/se-spider.html>

第三部分：可用性工具

*浏览器分辨率测试*：在不同屏幕分辨率、不同操作系统、不同浏览器下网页的显示效果。
 35. Browser Screen Resolution Checker -
Markhorrell<http://www.markhorrell.com/tools/browser.html>
36. Screen Size Tester - AnyBrowser
<http://www.anybrowser.com/ScreenSizeTest.html>  37. Screen Resolution
Checker - AndyLangTon<http://andylangton.co.uk/stuff/screen-resolution-checker>

*HTML及CSS验证*：毫无疑问,W3C的验证会让你取得更好的搜索引擎排名加分，赶快改正那些错误及不规范的代码吧。
 38. W3C Validator <http://validator.w3.org/>  39. WDG HTML Validator - Web
Design Group <http://www.htmlhelp.com/tools/validator/>  40. CSE HTML
Validator Lite <http://onlinewebcheck.com/>  41. Validation Services for
your HTML / XHTML / WML - Validome <http://www.validome.org/>  42. CSS
Validator - Jigsaw <http://jigsaw.w3.org/css-validator/>

*FireFox扩展*：更多可参考我之前写过的火狐SEO扩展 <http://www.kseo.cn/post/53.html>。
 43. W3C Validator <http://validator.w3.org/>  44. WDG HTML Validator - Web
Design Group <http://www.htmlhelp.com/tools/validator/>  45. CSE HTML
Validator Lite <http://onlinewebcheck.com/>

*页面速度测试*：页面小、下载速度快的网页谁深受用户喜欢。
 46. Speed Tester -
LinkVendor<http://www.linkvendor.com/seo-tools/speedtester.html>
47. Website Speed Test - Web Hosting Top
<http://www.web-hosting-top.com/web-hosting/tools.website-speed-test>
48. Website
Speed Test - Iwebtool <http://www.iwebtool.com/speed_test>  49. Speed test -
WebSite Goodies <http://www.websitegoodies.com/tools/speed-test.php>  50. Web
Page Speed Report<http://www.websiteoptimization.com/services/analyze/wso.php>

第四部分：其他SEO工具

*PageRank预测*：包括未来预测及当前PR值。
 51. Future PageRank - SEO
Chat<http://www.seochat.com/seo-tools/future-pagerank/>
52. Predict PageRank - Page Rank Prediction
<http://www.pagerankprediction.com/>  53. Future PageRank
<http://futurerank.com/rank/>  54. * Page Rank Prediction -
DNLodge<http://www.dnlodge.com/seo/pagerank_prediction.php>
55. Visual PageRank - Iwebtool <http://www.iwebtool.com/visual_pagerank>
56. Search PageRank - SEO
Chat<http://www.seochat.com/seo-tools/pagerank-search/>
57. Page Rank Tool <http://www.pageranktool.net/>

*流量排名*：网站的流量走势及搜索引擎分析。
 58. Alexa Traffic <http://alexa.com/site/ds/top_500?qterm>  59.
Awstats<http://awstats.sourceforge.net/>
60. ** Sitetracker <http://www.sitetracker.com/>  61. **
Histats<http://www.histats.com/>
62. ** Google Analytics <http://www.google.com/analytics/>  63.
Compete<http://compete.com/>

*搜索引擎饱和度*：搜索引擎索引网站网页的数量。
 64. Search Engine Saturation - Market
Leap<http://www.marketleap.com/siteindex/>
65. Search Engine Saturation Tool - Build Reciprocal
Links<http://www.build-reciprocal-links.com/searchengine-saturation/>
66. Search Engine Saturation -
SearchBliss<http://www.searchbliss.com/seo-tools/saturation.asp>
67. Search Engine Saturation Tool - To the Web
<http://totheweb.com/tools/sesat/index.php>  68. Search Engine Saturation
Tool - SEO Book <http://tools.seobook.com/general/sesat/>