Free GPL'ed Software for offline use of the comprehensive dict.cc dictionary (German/English - English/German). You need to download the dictionary textfiles from dict.cc directly. Better than this expensive Lion tool for LEO.
T. Pardo, and L. Rino. Série de Relatórios do NILC, NILC-TR-04-07. Núcleo Interinstitucional de Lingüística Computacional (NILC), São Carlos-SP, (Agosto 2004)