Wolfram Alpha the online answer engine that gives factual answers to queries by computing the answer from structured data, rather than providing a list of documents, has a comprehensive API.
Jan Pöschko has used the API to create Alpha Maps, a Google Map that allows users to view useful information about locations given by Wolfram Alpha on a map.
To use the application you just need to enter a location into the search box. The map then displays nearby locations as generated by Wolfram Alpha and also returns reams of data about the searched location. The information provided includes demographic information, economic data, current weather and time, crime statistics and other useful information, such as notable people born in the searched location.
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