Webmii is a people search mash up that agregates public information from other websites. Searches on Webmii generate automatically and dynamically a result page. This result page is built using automatic searches on other websites.
The top open-source alternatives to Webmii
are Max Impact Search.
One of the criteria for ordering this list is the number of mentions that products have on reliable external sources.
You can suggest additional sources through the form here.