CC-CEDICT is a Chinese to English dictionary, available for use online or for download (as a data file here: http://www.mdbg.net/chindict/chindict.php?page=cc-cedict). What similar projects provide an English to Chinese dictionary, with definitions of the English words explained in Chinese? I am looking for something with can be downloaded or purchased in a digital format (the data file, such as a commas-separated file or spreadsheet, not the front-end software used to view it).
Adsotrans is based on CC-CEDICT, but they also include (for non-commercial use) software for segmentation, hanzi2pinyin and apparently some sort of semantic analysis. I don't know whether dictionary itself differs from vanilla CC-CEDICT. Their download contains SQL instead of CSV. Also, if I remember correctly they used some sort sort of Latin-whatever encoding instead UTF-8.
If you're willing to pay then most popular option seems to licence ABC dictionary, but unfortunately University of Hawaii has granted Wenlin exclusive license so you'd have to sublicence it from them. See UH and Wenling respective pages here: www.otted.hawaii.edu/technology/00294/abc-chinese-language-database-dictionary and www.wenlin.com/abc.htm
If you find another free or free-ish/cheap database I'd be interested too.
There are several downloadable dictionaries for lingoes. However, the dictionaries seem to be in a proprietary format and can only be accessed with lingoes.