The zdt (Zhongwen Development Tool) is an easy to use, open-source Mandarin Chinese flashcard application.

1. Three different flashcard modes
2. Default word lists - Comes with the top 500 frequently used characters and the Kangxi Radicals character lists.
3. Easily import and export character lists -
4. Practice writing chinese characters - By watching each character's stroke order animation.
5. Simplified and Traditional character support - View characters in either mode.
6. Searchable database - Lookup entries by character, pinyin or english definition.
7. Chinese text annotation - Get mouseover popups with character definitions. Displays the corresponding pinyin as you type.
8. Integrated web browser - Surf Chinese based sites and easily add new vocabulary.
9. Sound support
10. Native CEDICT support and optional Adso support