Use these 160+ free tools for all the stages of SEO development:
http://www.searchenginejournal.com/seo-tools/7299/
From competitor analysis: backlink checker tools
To keyword formulation
To keyword domain suggestion
to all aspects of on page and off page SEO
Enjoy!
Also, for free linkbuilding tips and analysis, check out
http://www.highrevenue.com Also includes entries on social media traffic