Dictionary

http://www.natcorp.ox.ac.uk/

http://www.natcorp.ox.ac.uk/ 100M word -collection for english language “The British National Corpus (BNC) is a 100 million word collection of samples of written and spoken language from a wide range of sources, designed to represent a wide cross-section of current British English, both spoken and written. [more]”

http://imtranslator.com/default.asp useful translation and tts tools online (free, but login/registration required)

http://www.zhongwen.com/ online Chinese characters reference