Parley is a vocabulary trainer. It helps you to memorize your vocabulary, for example when you are trying to learn a foreign language.
クイックルックアップ
Quick Lookup is a simple GTK dictionary application powered by Wiktionary™.
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Artha is a free cross-platform English thesaurus that works completely off-line and is based on WordNet
辞書
This program allows you to search different kinds of dictionary services for words or phrases and shows you the result.