First of all what tool exactly do you mean? Axandra has some of them: IBP, Arelis... And effectiveness depends on what you want to get from the tool. So probably the best adviser is you yourself As looking for the SEO software to use I read a lot of reviews and watched comparison charts. I was going to give you some links, but according to the forum-rules just after my tenth post ) Surf i-net, read articles and forums and so on. Do not forget to try free editions of the software before purchasing it.