This page includes some of the best of these free offers. Then go to my Educational Resources and Lesson Plans site. Some of the sites on this page require you to register.
Registration is free, and so is what they offer.
However, just so you'll know, I've marked all sites that do require registration with an asterisk. If you don't like the banners, just scroll down the page and take a look at the text links. To avoid problems with registration, I'd suggest that you begin by downloading Gator. We have this program on all three of our computers. The version you will be downloading is the full version , not a demo or trial.