The best keyword software is the kind that is free. There are many versions of free keyword software out there but some are obviously better than others. The only true free keyword tool that you can count on is the Google Adwords keyword tool.

Most of the best free keyword software is not exactly free. Most of the really good ones offer a free trial period of have a free version that will need to be upgraded before you can perform certain critical tasks...tasks like copy and paste into a text file or create lists larger than 50 or 100 keywords.

When reviewing the best free keyword software you should look for features that will allow an easy upgrade from the free to the paid version and you should look for a free keyword tool that allows you full access to all of the features so that you can try them out before you purchase the upgrade. This will allow you to evaluate if the features suit what you are looking for.

Some of the Best Free Keyword Software include PPC Web Spy, Spy Fu, Keyword Spy, Wordtracker and Traffic Travis. Now keep in mind, as we said before, most of these tools will offer you a free version or a free trial and then you need to upgrade to a premium keyword version to get the full benefits.

Another thing to look for in the best free keyword software tools is that when you upgrade to the paid keyword tool you have to consider if you want a monthly subscription like that of Spy Fu, Wordtracker and Keyword Spy or if you want to get a keyword tool that has a one-time payment with free upgrades for life...like Keyword Elite, PPC Web Spy and Traffic Travis.

So if you are looking for the best free keyword software....keep in mind the good ones, the ones you want to keep in your affiliate tool kit will ultimately need to be upgraded to paid versions to be of benefit to you. The Google Keyword Tool is good but is no where near as comprehensive as some of the best paid-for keyword tools available.