Word Wizard combines text-to-speech capabilities with spelling tasks to allow kids to hear each word and letter while spelling it.
This app teaches about letters, how letters relate to sounds, and how to spell words.
This app builds on Simplex Spelling Phonics 1, adding 650 more words in 54 different lists.
You can view definitions and synonyms with dictionary.com and thesaurus.com, with no internet connection required.