超强的SEO工具集合，几乎包含了所有网上seo工具，不过全是英文
avangate网站收集了68个在线seo工具，（68 Online SEO Tools and Resources
）包括关键词工具、链接工具、可用性工具和其他工具，几乎包含了所有网上seo工具：
- Keyword Research Tool - Webmaster toolkit
- Keyword External Tool - Google Adwords
- Keyword Selector Tool - Inventory Overture
- Keyword Suggestions Overture - SEO Chat
- Website Keyword Suggestions - Webconfs
- Keyword Suggestion Tool - Self SEO
- Keyword Density - SEO Chat
- Keyword Density & Proeminence - Ranks
- Keyword Density Analyzer - Keyword density
- Analyze Keywords Density - Google rankings
- Keyword Density Checker - Webconfs
- Keyword Density Analyzer Tools - SEO Book
- Competition Tool - SEO Digger
- Competition Analysis Tool - Seoscorecard
- Top Competitor Tool - Webuildpages
- Search Engine Keyword Position - SEO Chat
- Keyword Analysis Tool - Mcdar
- SERPS Position Checker - LinkVendor
- Website Position Tool - Rnk1
- Link Popularity - SEO Chat
- Link Popularity Checker - Webmaster Toolkit
- Link Popularity Check - Widexl Internet Solution
- Link Popularity Check - Market Leap
- Link Popularity - Backlinks Checker - Search Bliss
- Backlink Analyzer - Sitening
- Check Backlinks - Webuildpages
- Class C Checker - Webrank Info
- Class C Checker - Webmaster Toolkit
- Class C Checker - SEO Chat
- Spider Simulator - SEO Chat
- Spider View - Iwebtool
- Search Engine Spider Simulator - Anownsite
- SE Bot Simulator - XML Sitemaps
- SE Spider - LinkVendor
- Browser Screen Resolution Checker - Markhorrell
- Screen Size Tester - AnyBrowser
- Screen Resolution Checker - AndyLangTon
- W3C Validator
- WDG HTML Validator - Web Design Group
- CSE HTML Validator Lite
- Validation Services for your HTML / XHTML / WML - Validome
- CSS Validator - Jigsaw
- Developer ToolBar
- SEOpen
- SEO Links Extension
- Speed Tester - LinkVendor
- Website Speed Test - Web Hosting Top
- Website Speed Test - Iwebtool
- Speed test - WebSite Goodies
- Web Page Speed Report
- Future PageRank - SEO Chat
- Predict PageRank - Page Rank Prediction
- Future PageRank
- Page Rank Prediction - DNLodge
- Visual PageRank - Iwebtool
- Search PageRank - SEO Chat
- Page Rank Tool
- Alexa Traffic
- Awstats
- Sitetracker
- Histats
- Google Analytics
- Compete
- Search Engine Saturation - Market Leap
- Search Engine Saturation Tool - Build Reciprocal Links
- Search Engine Saturation - SearchBliss
- Search Engine Saturation Tool - To the Web
- Search Engine Saturation Tool - SEO Book
http://www.linkvendor.com/seo-tools/
提供专业的在线seo工具，包括网站分析、域名流行度、链接估价、pagerank多数据中心查看、服务器上所有网站查看、搜索结果排名、关键词密度检测等15个很实用的seo工具。
