The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
Mobile e-textbook reader made by you. Your textbook's not provided in e-book form? No problem. The general idea is being able to take pictures of a hardcopy textbook and view the pages you snapshotted. Feather helps you organize different textbooks and the pages in each of them.