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iBDC is a Cocoa application on Mac OS X for Chinese people to learn English interatively. It aids the learning by displaying words in flash card like action, and it also provides the quiz feature in multiple choice style.
VocableTrainerX is primarily intended for studying new vocabulary when learning a foreign language. Use it to compile your vocabulary lists and use the program's quiz mode to test yourself on the list. It runs under Mac OS X (Version 10.3 or later).
WordReview is a Mac OS X application that is intended to be used to review information (words, definitions) in all languages supported by the OS. Using a quiz/flashcard approach, it adjusts difficulty according to the user.
Petite is a tailor made library to develop using Objective-C, without any NeXTStep syntax. Petite is there to help people to discover Objective-C programming.