AquaPath is a free Cocoa-based developer tool for Mac OS X Tiger that allows you evaluate XPath expressions against any XML document and view the result sequence in a dynamic, intuitive tree representation.
iVisualize is an iTunes Plug-In that plays quartz compositions as iTunes Visualizations.
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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.