The Bluefire Reader app allows you to download ebooks in ePub or PDF format that are protected with Adobe DRM directly to an Apple device such as the iPhone/iPod Touch/iPad. You can also transfer ebooks to the Bluefire Reader app from Adobe Digital Editions.
The Aldiko app allows you to read ebooks, in ePub or PDF format that are protected with Adobe DRM, that have been transferred from Adobe Digital Editions to an Android device.