Educational Apps

http://kidsactivitiesblog.com/free-educational-apps-for-kids/

Art:
Doodle Dandy
Draws with various degrees of symmetry. (You can change color and line width, too.) It’s great for learning what symmetry means and studying its effects. My son has been using it to make a new wallpaper.

Foreign Languages:
50 Languages
50languages.com contains 100 lessons that provide you with a basic vocabulary. This free app has 30 lessons. With no prior knowledge, you will learn to fluently speak short sentences in real-world situations in no time.

Language:
Dictionary Flashcards
Study, learn and master words on your phone. Create and play fun, tailored study programs anywhere, anytime. Create your own or choose from over 70,000 flashcard decks, customize your study by grade level, standardized test, or subject, select your study method – audio pronunciation or definition matching, sync your online and mobile app progress, and study offline without an internet connection.
iStoryBook
For ages 2-8 Books that will read to your little one. From Fairy Tales to Fables to Folk Tales
Practice English Grammar - 2
Practice English Grammar (Beginner Level) contains many pages of grammar lessons explaining the grammar topics of the tests. With over 500 questions in 16 topics, this app helps you practicing the basic usage of English grammar in elementary level.

Math:
Kids, Numbers and Math Lite
Free version good for introductory or preschool math concepts

Preschool:
Oolly App
Learn 5 languages (50 words), fine motor skills, recycling