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Perian is a free plugin that enables QuickTime to play almost every popular video format.
RCDefaultApp is a Mac OS X 10.2 or higher preference pane that allows a user to set the default application used for various URL schemes, file extensions, file types, and MIME types.
html tidy für macosx service menü
WaterRoof is an IPFW firewall frontend for Mac OS X with a easy interface and many options.