Foxy SEO Tool - A Firefox add-on to help with Search Engine Optimisation

Partners

Here are commercial services that might be of interest to SEO professionals:

SEMrush
SEMRush.com was designed by the developers of SeoDigger and SeoQuake for Google organic and AdWords keywords research.
 
SEOmoz is the world's most popular provider of SEO software. Their easy to use tools and tutorials make search engine optimization accessible to everyone. The powerful SEOmoz API delivers our Linkscape web crawl data to their SEO tools, Open Site Explorer and dozens of third-party applications.
 
Wordpot
Wordpot strives to provide you with the best keyword analysis tool on the internet. Their searches are faster than all our competition, save time with your keyword research using our simple user interface and lightning fast searches.
 
wordtracker.com
Wordtracker helps website owners and search engine marketers identify keywords and phrases that are relevant to their or their client's business and most likely to be used as queries by search engine visitors. Marketers can also determine how many competing sites are using those keywords and can identify the phrases that have the greatest traffic potential.
 
Best of the Web Directory
The original "Best of the Web" got its start in 1994 when Brandon Plewe, then a student at State University of New York, Buffalo, created a platform enabling the burgeoning online community to nominate and vote for best-of-class websites in a variety of categories. From the initial concept of Web Awards, Best of the Web transformed into a comprehensive directory categorizing content-rich, well designed websites.
 
Builtwith Website Optimizer
The website optimizer is an application that can help you get more out of your website. By means of analysis of your website SEO or tracking your competitors and your search result history.