Haiku Deck could be used with any content area. It is just a simplified Keynote/Powerpoint tool that you can use on the iPad with younger children (older children love it too!) Here is a quick video tutorial:
Haiku Deck from Julie on Vimeo.
Another pretty cool and even easier app you can use in your classroom across content areas is Sticky Notes. Students can create "sticky notes" that I call "posters" with vocabulary terms and visuals. This week I used this in a 1st grade class as word study support. Check out this Short O sticky note:
|February 27, 2014|
Sticky from Julie on Vimeo.