Lingoes
Lingoes is another free (but not OpenSource) alternative to Babylon. If you are looking for a free and Opensource alternative then try GoldenDict http://wpkg.org/GoldenDict.
You can download Lingoes from http://www.lingoes.net/
The installer will also create an Desktop-Icon (%ALLUSERSPROFILE%) and a shortcut to QuickLaunch of the current logged in user.
<package
id="lingoes"
name="Lingoes Uebersetzung"
revision="%version%"
reboot="false"
priority="0">
<variable name="version" value="2.8.1" />
<check type="uninstall" condition="exists" path="Lingoes %version%" />
<install cmd='%SOFTWARE%\lingoes\lingoes_%version%.exe /SILENT' />
<upgrade include="install" />
<remove architecture="x86" cmd='"%PROGRAMFILES%\Lingoes\Translator2\unins000.exe" /SILENT' />
<remove architecture="x64" cmd='"%PROGRAMFILES(x86)%\Lingoes\Translator2\unins000.exe" /SILENT' />
</package>