First are the FREE APPS. While most of them are for the IPAD they do have a few for Android based tablets. You have to scroll down to the second section to find the FREE ones. The first section is new apps, the second lists the free ones.
While they don't have very many apps for us Android users what I do use a lot are their FREE Worksheets. In order to get those you have to be one of their Facebook friends. Then each week on Facebook they will post a FREE Worksheet to be downloaded. It's only up for a limited time so I can't link you to any specific page, but if you click on their image it will take you to their Facebook page. Once you click like and start following them you will soon find them sharing their FREE Worksheets. What I do is print the ones I like and file them away and when I need something to do for therapy that week I work it in.