Rhythm Sight Reading Trainer
Love this. For iPad. A bargain at $2.99.
Sight Reading Machine
Generates melodies for you to sight read. Have not tried – not sure how the interface works. For iPad.
Again, have not tried this, but looks worthwhile. For iPad. Free.
Rhythm Cat Lite
For iPad. Free on app store. Haven’t tried. Some reviews have mentioned a bit of a lag, but still could be very useful.