A customized user interface is configured to include one or more user interface gadgets provided by one or more user interface gadget providers. Multiple possible user interface gadgets are identified for inclusion in the user interface by comparing a set of required attributes for the user interface to stored attribute data for a plurality of registered user interface gadgets. One or more of the possible user interface gadgets is selected for inclusion in the user interface using stored evaluation data for the possible user interface gadgets. Data related to the selected user interface gadget(s) is provided for use in generating the customized user interface on a computer system.