Best FREE SEO Tools for On-Page Optimization | SEO | Search Engine Optimization Software

For Duplicate content checker :
http://copyscape.com/

Website Analysis Tools: Free Website Analysis Tools
http://www.seoptimer.com/
http://www.quicksprout.com/
http://www.seowebpageanalyzer.com/
http://analyzemysites.com/analyzemysite/mainsearches?form
http://iwebchk.com/
https://moz.com/researchtools/ose
https://www.woorank.com/
https://seomator.com/
http://www.site-analyzer.com/
https://gtmetrix.com/
https://www.site24x7.com/
http://www.websiteanalysis.com/
http://seositecheckup.com/

For use the site status :
http://www.seoptimer.com/
https://www.woorank.com/
http://analyzemysites.com/
http://seositecheckup.com/
http://nibbler.silktide.com/ 

For Page Rank Checker :
http://pagerank.my-addr.com/
http://smallseotools.com/google-pagerank-checker/

For website 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/(For find the traffic) 


Google Webmaster:
http://www.google.com/webmasters/(For find 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/ 


For Robots.txt Checker:
http://tool.motoricerca.info/robots-checker.phtml

For Sitemap Generators:
https://code.google.com/p/sitemap-generators/wiki/SitemapGenerators
http://www.xml-sitemaps.com/

Download Free A1 Sitemap Generator for create all On page files 

For ROR Sitemap Generator:
http://www.avrams.ro/ror-generator.html
http://www.sitemapxml.net/
http://www.thebitmill.com/tool/ror_generator.html


For RSS Generator:
http://www.sitemapdoc.com/


Ad Words Keyword Tool for Keyword Research:
http://www.google.com/adwords/
http://www.wordstream.com/free-keyword-tools


Google Cache Checker:
http://smallseotools.com/google-cache-checker/


Google Index Checker:
http://smallseotools.com/google-index-checker/


For site status Checker:
http://smallseotools.com/whois-checker/http://www.domaintools.com/


For Check Website Loading Time:
http://www.iwebtool.com/speed_test
http://numion.com/Stopwatch/index.html
http://developer.yahoo.com/yslow
http://iwebchk.com/

For Brokenlink Checker:
http://www.brokenlinkcheck.com/
http://www.siteliner.com/  

Web Performance. Learn more about web performance tools at Google
https://developers.google.com/speed/pagespeed/insights/

Free image sitemap generator
http://www.angeldigital.marketing/image-sitemap/