Wiktionary's English Phrasebook, The Free Dictionary's Idioms and LingvoSoft Online's Phrasebook are three examples of dictionaries that list phrases instead of single words. Whereas Wiktionary's English Phrasebook and The Free Dictionary's Idioms only provide definitions for English phrases, LingvoSoft Online's Phrasebook also offers translations of phrases between languages.
Wiktionary's English Phrasebook is the phrases and idioms section of Wiktionary, a free open source dictionary that depends on user-generated content for its definitions. The Free Dictionary's Idioms is another free phrase dictionary, but instead of depending on user-generated content, it takes its definitions from the Cambridge International Dictionary of Idioms. LingvoSoft Online's Phrasebook is a collection of multi-language phrase dictionaries mainly targeted at travelers who want a quick translation of phrases from one language into the other.