Pinyin Trainer by trainchinese
iPhone, iPad,
Android (free)
Pinyin Trainer will help you practice the tonal nature of Mandarin using Pinyin, the standard Romanization system for Mandarin Chinese.
Pinyin Pronunciation
BlackBerry ($0.99)
Pinyin Pronunciation is designed for beginners to easily follow the software to speak the pinyin of each Chinese character.
Chinese Number Trainer by trainchinese
iPhone, iPad (free)
Translate numbers to and from Chinese, test yourself with the quiz (watch out for that rocket) and present your contacts' details in Chinese.
Chinese Character Trainer
Android (free)
This app uses flashcards to teach Chinese characters that are based on the Jun Da Character frequency list of Modern Chinese.
Pleco Chinese Dictionary
iPhone, iPad (free),
Android (free trail)
Pleco is the ultimate Chinese learning companion - an integrated Chinese dictionary / document reader / flashcard system with fullscreen handwriting input and live camera-based character recognition.
ZAKER
iPad (free)
ZAKER iPad customized specifically for readers, to show the best reading experience for microblogging, news, blog, newspaper, magazines and other information.
Radio Chinese
iPhone, iPad,
Android,
BlackBerry (free)
Radio Chinese Plus+ brings you popular U.S. based Chinese radio stations and music channels featuring top Mandarin radio station KAZN-AM1300 in Los Angeles, top Cantonese radio station KMRB-AM1430 in Los Angeles, top Mandarin radio station WKDM-AM1380 in New York, top Cantonese radio station WZRC-AM1480 in New York, and other popular Chinese music channels.