Here are some (mostly) free Apps for learning Japanese hiragana characters and English alphabet. Each link will take you directly to the iTunes Store or Google Play Store.
For iOS:Japanese Tracing: HiraganaPractice Tracing each character in the proper stroke order.
Japanese-hiraganaTrace each character while hearing the proper pronunciation and a vocabulary word.
Hiragana Katakana WritingAnother tracing app. Tap the speaker to hear pronunciation.
App version of starfall.com
For more advanced students
The Tracing App for kids
For Android:
Trace each character while hearing the proper pronunciation and a vocabulary word.
Practice Tracing each character in the proper stroke order.
App version of starfall.com
For more advanced students
Tracing and Phonics App for kids