I took the time to put together a complete list of Free SEO tools on the SEO Group Wiki. These are tools that many SEO consultants, including myself, use on a day-to-day basis including tools for; website review, competitive analysis, industry analysis, keyword research, technical review, link building, website tracking/monitoring and even firefox extensions.
Using these tools can help you get a better understanding of search engine optimization practices and point out any weaknesses your site may have. A great way to keep up with new tools and seo news is to read sites like sphinn.
Once your signed up to the wiki feel free to add your own tools or create other wiki pages.
