This site gives five useful ipad applications that teachers can use in their classrooms. Notability, Haiku Deck, Edmodo, Show Me, and Google Drive.
Notability- note taking app, you can create shared folders between students and teachers
Haiku Deck- presentation app
Edmodo- connect and share documents, group projects
Show Me- presentation and creation app
Google Drive- collaborative projects, take notes, and access documents in multiple places