Here is a very good resource of apps specifically curated for autistic learners. This is a spreadsheet created by a parent, an autistic adult and an SLP and features a very big collection of iPad apps for autism. The apps are arranged into different categories that include : art, books, communication, earliest learning, file sharing, games, general development, geography, history, language, math and pre-math, multiple activities, music, reading and spelling, puzzles, science, social skills, speech, and many more. Every app is supplemented with a short description, a video if available, review if available, and iTunes link.
Click here to access the iPad Apps for Autism Spreadsheet.