Ex illis is now available from the Apple iPhone App Store.
From their announcement:
Great news: Ex illis is now on App Store.
The wait is over, Apple finally reviewed the software and made it available on App store. Now all you need to do is search for “Ex illis” and download it directly to you iPhone/iPod Touch. You can also download it on your computer via iTunes.
Now you can play to Ex illis using PC, Mac, iPhone and iPod Touch; the software is always free.