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I would never use something like that always bites you on the arse.  It seems too good to be true which it is.

Hi Kara, Welcome to SEOmoz! Thanks for coming here to ask that question. It might help if you think of it the other way around -- are there credible sites that would allow a magic software to create links from them? You might want to read the chapter on building links in our Beginner's Guide to SEO at http://www.seomoz.org/beginners-guide-to-seo/growing-popularity-and-links. It will give you a good introduction to quality link building.

That information applies to advertising, not SEO. If you are seeking a tool to help you understand organic keyword difficulty, you can try the SEOmoz Keyword Difficulty Tool What you need to understand most is even the best SEO tools only have value when used by someone who fully understands the process (i.e. can perform the task without the tool) and fully understands how the tool operates. In addition, the person needs to have experience using the process and tool to gain the most value. As a direct result of good SEO techniques, small businesses have moved out of their homes and into offices then grown into mid-sized businesses. Mid-sized businesses have grown into large businesses, and large businesses have increased sales by millions. SEO is a big field. There are single domains which have sold for millions of dollars. There are sites which have cost millions of dollars to build. If you want to start learning SEO, an excellent place is here: http://www.seomoz.org/beginners-guide-to-seo Beyond that, it takes a lot of time and dedication. I have been involved with SEO on various levels for years and I still learn every week.

I've always felt that you're better off having a branded domain rather than a keyword stuffed domain just for the sake of having keywords in it. The slight SEO advantage you may or may not gain is not worth it in the long run compared to being able to build a strong brand.