GRKda Keyword Density Analyzer - this program is useful for analyzing the text on each page of your site for proper keyword density. GRKda features highly customizeable reporting and the ability to compare many pages at once.

AMeta Meta Tag Optimizer - meta tags aren't nearly as important as they used to be, however, you still do not want to ignore them. This tool will help you be sure your meta tags are in the appropriate format for search engines.

OptiLink Link Popularity Analyzer - OptiLink is a very useful tool that will help you determine your link reputation. OptiLink doesn't just determine who is linking to you but also HOW they are linking to you. Use this tool on your competitors sites and see what they are doing right and wrong!

Wordtracker - Wordtracker is a very useful online tool to help you determine which keywords are searched and what other words or phrases you may want to optimize for.

Overture Keyword Suggestion Tool - This is another tool similar to Wordtracker. It is wise to use this tool in conjunction with Wordtracker when optimizing your site for a given keyword.