Free tools for SEO

There are 11 free goups SEO tool, will help your website communicates with search engine easier
01. Link Tools
+ Backlink Checker
+ Link Analyzer
+ Link Extractor
+ Link Popularity Checker
+ Link Suggestion Generator
+ Multiple Backlink Checker
+ No-Follow Finder
+ Reciprocal Link Checker

02. Keyword Tools 
+ Keyword Density Checker
+ Keyword Extractor
+ Keyword Rich Domain Finder
+ Keyword Suggestion Generator
+ Multiple Keyword Search Engine Position
+ Multiple Website Search Engine Position
+ Search Engine Position Checker


03. Authority Link Tools 
+ .edu Backlink Checker
+ .gov Backlink Checker
+ Authority Link Checker
+ DMOZ Backlink Checker
+ Multiple .edu Backlink Checker
+ Multiple .gov Backlink Checker
+ Multiple Authority Link Checker
+ Multiple DMOZ Backlink Checker
+ Yahoo Directory Backlink Checker

04. Search Engine Tools 
+ Bing Indexed Pages Checker
+ Google Indexed Pages Checker
+ MSN Live Indexed Pages Checker
+ Robots.txt Checker
+ Search Engine Listing Preview
+ Search Engine Saturation Checker
+ Site Spider Viewer
+ Spider Viewer
+ Yahoo Indexed Pages Checker

05. Website Rank Checkers 
+ Alexa Traffic Rank Checker
+ Compete Ranking Checker
+ Compete Statistics Checker
+ Fake Rank Checker
+ PageHeat Checker
+ PageRank Checker
+ Site Rank Checker

06. Multi-Site Rank Checkers 
+ Alexa Multiple Rank Checker
+ Multi-Rank Checker (PageRank and Alexa)
+ Multiple Compete Rank Checker
+ Multiple Compete Statistics Checker
+ Multiple Fake PageRank Checker
+ Multiple PageHeat Checker
+ Multiple PageRank Checker

07. Header/Tag Tools 
+ HTTP Header Extractor
+ HTTP Header Viewer
+ Meta Tag Extractor
+ Meta-Tag Generator

08. IP Tools 
+ Multiple IP Address Checker
+ Multiple Reverse IP Lookup
+ Ping Domain/IP
+ Reverse IP/Look-up

09. Miscellaneous Tools 
+ Browser Details Tool
+ Convert Date to Timestamp
+ Convert UNIX Timestamp
+ Email to Image Converter
+ JavaScript Clock
+ Send Anonymous Emails
+ URL Shortener
+ Website Status Checker

10. Source Code Tools 
+ CSS Validator
+ Domain Whois Retriever
+ HTML Encrypter
+ HTML Markup Validator
+ HTML Optimizer
+ MD5 Encrypter
+ Source Code Viewer
+ Webpage Size Checker
+ Website Speed Test

11. Social Web Tools 
+ Delicious Link Checker
+ Digg Links Checker
+ Multiple Delicious Link Checker
+ Multiple Digg Links Checker
+ Twitter Links Finder