Free dictionaries available in the DICT format:
Combined, they make up the Free Internet Lexicon and Encyclopedia.
StarDict is a desktop dictionary. It doesn't support the DICT protocol directly. Instead, it provides a converter, which would imply that you need to store data twice if you want to use it both with the DICT protocol and with StarDict.
There are also programs that read the DICT file format directly. For example, S60Dict is a dictionary program for Symbian Series 60 that uses DICT dictionaries.