Check out the Waze API.
Waze API
Mapping
US Yellow Pages API
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Postcode Anywhere API
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ParkWhiz API
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Instamapper GPS Tracker API
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Indogsm Cell Phone Tracker API
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National Geographic FieldScope API
Check out the National Geographic FieldScope API.
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HackerTarget.com API
Check out the HackerTarget.com API.
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PlugShare Station API
Check out the PlugShare Station API.