ZDT - Zhongwen Development Tool

The ZDT (Zhongwen Development Tool) is an easy to use, open-source Mandarin Chinese flashcard application that can help you learn Chinese. It is written in Java using the Eclipse RCP platform.
Features:
Three different flashcard modes - Learn chinese by memorizing those words!
Create categories for your vocabulary - Organize your character lists however you like. Test yourself using any combination of categories.
Built-in chinese word lists - Get started right away with the top 500 frequently used characters and the Kangxi Radicals character lists.
Easily import and export character lists - Get new character lists. Contribute your own and help others out! You can also export your lists into other popular programs like VTrain, PlecoDict, and SuperMemo.
Practice writing chinese characters - By generating custom practice writing sheets using your own categories. Learn proper writing technique by watching each character's stroke order animation.
Simplified and Traditional character support - View characters in either mode.
Searchable database - Lookup entries by character, pinyin or english definition.
Chinese text annotation - Get mouseover popups with character definitions. Displays the corresponding pinyin as you type.
Integrated web browser - Surf Chinese based sites and easily add new vocabulary.
Sound support - We have a few available sound plugins for download. Hear a native mandarin speaker speak selected characters.
Integrated stroke animation - Learn to draw chinese characters. Radical is red to distinguish and learn it better.
Native CEDICT support and optional Adso support - The Cedict database contains over 100,000 entries. The Adso database contains more than 120,000 entries and now has traditional character support.
Integrated HanDeDict - HanDeDict is a Chinese-German-Chinese dictionary which contains 149,832 entries and 180,521 definitions and has simplified and traditional character support.
Extensible - based on Eclipse RCP platform with its nice plugin architecture.
Free and Open Source - EPL based license. Free is always good!
Available for Windows, Linux and Mac platforms