Bulgarian Language Pack This app contains a large Bulgarian dictionary and keyboard layout for AnySoftKeyboard. Recommend!
MSDict Bulgarian<>ENGLISH Excellent Bulgarian<>English dictionary that claims to be free but is not. Over 8,000 words and many search functions.
Byki Bulgarian This is a fun, comprehensive language learning app with photos, written words, and audio pronunciations of the words. It costs $9.99 but is worth it as you really do learn from it. It has lots of learning features like quizzes and you can share your progress to Facebook.
SlideIT Bulgarian Phonetic If you use SlideIT keyboard then this will give you the Bulgarian key layout and dictionary for it.
uTalk Bulgarian This is a great learning app and costs $9.6. It has a variety of learning tools and makes use of pictures and quizzes and fun games. Can't store on SD card. :(