(Updated January 2013)
Ahrefs – The largest index of live links and the best tool to spy on your competitors actual keywords Index is updated every 15 min Free to try.
Broken Link Checker – This free online Checker / Validator not just tells you which of your hyperlinks are dead but it will also show to your where exactly those stale references locate in your HTML code.
Check You Link Popularity Free backlink checker. The inbound link checker lets you check the backlink numbers of your own website and the backlink numbers of your competitors quickly and easily. For each website, you get the total number of backlinks, the number of unique backlinks, the website rank and the website trust. You will also get the Google rankings and the AdWords ads of the analyzed site.
Comment Kahuna – Free Link Building Software Download your free copy of this powerful website traffic promotion software that will get you thousands of high quality and high traffic backlinks without spamming or using black hat techniques. This is NOT automated link building software.
Fast Blog Finder – The quickest, easiest way to find do follow back links.
Majestic SEO Bulk Link Checker – The Bulk Backlink Checker allows you to analyse the backlink numbers for up to 400 URLs using the paste URLs feature, and upto 100,000 URLs from a file upload (depending on your subscription level). The results show a summary of the total number of links that we find, with the total number of referring domains, educational and government numbers.
My SEO Blog DoFollow Blogs – Lists and Directories of Dofollow Blogs. The page was created in 2008 so some of the entries probably no longer exist.
My SEO Blog DoFollow Forums – List of “Dofollow” Forums with “Dofollow” Signatures. The page was created in 2008 so some of the entries probably no longer exist.
SBI’s Link Trading – Don t go after any link Get high quality, relevant links How With The SiteSell Value Exchange You ll receive notifications whenever other sites with related quality content are also looking for links.
Solo SEO Link Search Tool – Find related sites, blogs, directories and more just by entering your keyword.