Chinese tools
This site has a collection of online Chinese tools to help you to learn:
Chinese - English dictionarySearch for words using traditional or simplified Chinese characters, Hanyu Pinyin or English. You can add words to your My Zhongwen collection and comment on words to help other users.
Pinyin character converter
Add visible tone marks to words to help learn their tones. You can also export HTML for use in creating web pages.
HanziMatic
Submit passages of Chinese text and the HanziMatic will find all the words contained within. It will highlight all the words, allowing you to hover over with your mouse and see an instant translation. You can add any of the words to your My Zhongwen collection for future reference.
Quick dictionary
Search the English-Chinese dictionary: