Common Crawl - a free web crawl with link graph data from Common Search.
Web Directories Reviewed - editorial post about what directories are the most valuable from an SEO perspective.
Reciprocal Link Checker - script to help you automate finding out if your reciprocal link partners are still linking back at your site.
Link Suggest Tool - list of words and phrases like add URL, directory, ezine, etc. where you may be able to add links or buy ads.
Comments
I always recommend : https://moz.com/researchtools/ose/
Web Directories Reviewed - editorial post about what directories are the most valuable from an SEO perspective.
Reciprocal Link Checker - script to help you automate finding out if your reciprocal link partners are still linking back at your site.
Link Suggest Tool - list of words and phrases like add URL, directory, ezine, etc. where you may be able to add links or buy ads.