Here are a few of the apps that I have had the most success using with my students:
Answers Yes/No HD - This is simple AAC app. It can use pictures and/or words. I use this during snack time as it provides a consistent verbal model for the student. They can use it request or use it as the model, then request with own voice.
Injini Game Suite - This is a bit "pricey", but the amount of activities within app is pretty impressive. I use this app at least twice a week with my students to work on visual motor and tracing activities. I feel that this app has lead to the progress one student has made with writing her name. At the beginning of the year, she wouldn't hold any writing instrument. She can now print 6 out of the 8 letters in her name. Graphics are more early childhood based.
Write My Name - This app is by the same developers as Injini. It can be customized to the needs of the students. Another great app to work on letter formation and visual attending skills.
Bugs and Buttons - This app provides similar activities to the Injini Game Suite, but graphics are for a little bit older students or any student with a LOVE for bugs. This activities included in Bugs and Buttons are a "steal" for the price.
AutismXpress and AutismXpress PRO - These apps are great for demonstrating feelings. I use AutismXpress with my students to compliment out reading program, a way to comment on books/characters, and when students are struggling with behavior.
Letter School - This is a vary flexible app to teach tracing and letter formation. It provides multiple levels of trials. It engages the user kinesthetically, visually, and auditorally. With the choice of upper case, lower case, and numbers 1-10 with options for Zaner-Bloser, De'Nealian, and Handwriting without Tears. (Detailed review to come in April)
Abilipad - This app allows you to create adapted/customized keyboards. These keyboards can be used to create/write sentences on the letter or word level or used as a communication app as well. (Detailed review to come in April)
OT apps - very organized and detailed list of apps that support fine motor development
Apps and Resources for People with Autism