Lauren S. Enders, MA, CCC-SLP Honorable Mention
FREE Language Apps for SLPs
http://www.pinterest.com/lasenders/free-language-apps-for-slps/
Talking Tom Cat
A person talks to this app, and the app repeats what you said in a cartoon voice. The app is free. You can also buy a number of other similar apps for a few dollars from the app developer.
https://itunes.apple.com/us/app/talking-tom-cat/id377194688?mt=8
Here is a list of similar apps made by the developer. I have to warn you that some of the stuff in these apps is not appropriate for school. If you are a parent and you want to get one of these apps for your child that is okay. You want to be careful about teaching children inappropriate social behaviors. I used many of these apps with a family member, and I like them.
Verbally
If you are considering an AAC app, this is a good one to try first.
https://itunes.apple.com/us/app/verbally/id418671377?mt=8
Articulation Station
This is another popular app that is highly rated. Both the free and paid versions of Articulation Station are very good apps to help teach basic sounds to students.
https://itunes.apple.com/us/app/articulation-station/id467415882?mt=8