SEO Free Tools

Robots.txt File Generator Tool

A robots.txt file is a file that prevents the googlebot from crawling certain pages of your site. To generate free robots.txt file click on the below link:

 http://tools.seobook.com/robots-txt/generator/

Backlink Checker Tool

Backlink Checker Tool determine how many backlinks are pointing to the website or link you entered.
The backlink check tool runs a series of tests to determine how many backlinks are pointing to the website or link you entered. Additional information is also being collected including anchor text used, Page Rank of the backlink source, and any potential flags or warnings for each individual link.

http://smallseotools.com/backlink-checker

Google Analytics & Google Webmaster Tool

Google Analytics is a most used analytics tool which is available  for free by Google. This analytics tool can give you detailed reports about traffic behavior, content visitation, funnel information and more. On the other hand, the Webmaster tool gives you a good view of what Google "sees" for your site including: crawling rate, crawling speed, backlinks, highest Page Rank of your site and more.
http://www.google.com/webmasters/
http://www.google.com/analytics/

On-Page Analysis Tool

Through the above tool you can find out how well your pages are optimized for target keywords with this On-Page Optimization tools, and improve for optimal performance.
http://www.seomoz.org/tools

SEO For Chrome

SEO for Chrome is a good tool that will make your SEO tasks easier. Your can easily see Page Rank, backlinks, estimated traffic, and even conduct keyword research for a website, all through Chrome browser.

https://chrome.google.com/webstore/detail/seo-for-chrome/oangcciaeihlfmhppegpdceadpfaoclj 

Domain Age Checker Tool

Domain Age Checker is a good tool to know the age of a website and allows you to examine, how the website looked, when it first started. 

http://www.seomastering.com/domain-age-checker.php

Duplicate Content Checker Tool

If you want to check the duplicate content of your website then click on the below URL & enter your website. It will quickly check & let you know about duplicate content if any.

http://www.copyscape.com/ 

Multiple URLs Opening Tool

If you want to open multiple URLs at a same time then click on the below URL & enter your website list.

http://www.urlopener.com/index.php