Helpful seo tools

1. Helpful SEO Tools
SEO Tools
For Duplicate content checker :
http://Copyscape.com
For use the site status :
1). woorank.com 2). http://www.seoptimer.com/
For Page Rank Checker :
http://pagerank.my-addr.com/
http://smallseotools.com/google-pagerank-checker/
For traffic :
http://www.alexa.com/
For HTML Error Checker :
http://validator.w3.org/
For Broken Link Check :
http://validator.w3.org/checklink
Bing Webmaster Tool:-
http://www.bing.com/:toolbox/webmaster
Google Analytics:
http://www.google.com/analytics/

2. Google Webmaster:
http://www.google.com/webmasters/
(For finding the Error-404 & HTML improvement )
Similar Page Checker:
http://www.webconfs.com/similar-page-checker.php
Google Map Maker:
http://www.google.com/mapmaker
For Domain Age :
http://www.searchenginegenie.com/tools/DomainAgeChecker.php
http://www.seologs.com/dns/domain-check.html
http://smallseotools.com/domain-age-checker/
Robots.txt Checker:
http://tool.motoricerca.info/robots-checker.phtml
Sitemap Generators:
https://code.google.com/p/sitemap-generators/wiki/SitemapGenerators
http://www.xml-sitemaps.com/
ROR Sitemap Generator
http://www.avrams.ro/ror-generator.html
http://www.sitemapxml.net/
http://www.thebitmill.com/tool/ror_generator.html
Ad Words Keyword Tool for Keyword Research:
http://www.google.com/adwords/ & http://www.wordstream.com/free-keyword-
tools

3. Google Cache Checker:
http://smallseotools.com/google-cache-checker/
Google Index Checker:
http://smallseotools.com/google-index-checker/
Whois Checker:
http://smallseotools.com/whois-checker/
http://www.domaintools.com/
Check Website Loading Time
http://www.iwebtool.com/speed_test
http://numion.com/Stopwatch/index.html
http://developer.yahoo.com/yslow
https://developers.google.com/speed/pagespeed/insights
For Brokenlink Check:
http://www.brokenlinkcheck.com/
You can get more information on Avoid These Things for Better
SEO