I m using this and this is best free seo tool i ever seen
What would happen if you smooshed together many of the best parts of Rank Checker,
SEO for Firefox, the best keyword research tools across the web, a feed reader (pre-populated with many
SEO feeds), a ton of competitive research tools, the ability to compare up to 5 competing sites against each other, easy data export, and boatloads of other features into 1 handy Firefox extension? Well, you would have the
SEO Toolbar.
SEO Toolbar Features: 
As you surf the web the
SEO Toolbar pulls useful market research data right into your browser, including:
Link Information - Links: (Yahoo! linkdomain) shows a rough estimate of the total number of links pointing at a domain
- Page Links: (Yahoo! link) shows a rough estimate of the total number of links pointing at a page
Under the advanced information button

you can also see details like
- Uniqe linking domains: this comes from the fine folks at Majestic SEO
- .edu Link: (Yahoo! .edu linkdomain ) shows a rough estimate of the total number of .edu links pointing at a domain
- .edu Page Link: (Yahoo! .edu link ) shows a rough estimate of the total number of .edu links pointing at a specific page
- .gov Link: (Yahoo! .gov linkdomain ) shows a rough estimate of the total number of .gov links pointing at a domain
Directory Information - Dmoz: searches the Google Directory to count the total number of pages from a site that are listed in DMOZ, and the total number of pages listed in DMOZ that reference that URL.
- dir.yahoo.com: is a site listed in the Yahoo! Directory or not
- BOTW: is a site listed in the BOTW Directory or not
Other Competitive Details - PR: (Google PageRank) an estimated measure of global link authority
- Age: age pulled from Archive.org, shows the first time a page was indexed by Archive.org’s spider. The theory is that if Archive.org found a page so did many of the major search engines.
Check Full Features And Download From Here