CartoDB is a geospatial database on the cloud. CartoDB allows users to make their data geolocal and map the data, as well as import geospatial datasets to create location-aware applications.
The CartoDB API allows developers to access and integrate the functionality of CartoDB with other applications and to create other applications. CartoDB offers a SQL API, as well as tile maps API. Example API methods include creating maps, performing queries of geospatial data, and rendering maps.
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There is a vmdk virtual machine and a EC2 Amazon AMI available with CartoDB pre-installed:
so CartoDB can be tested locally or on the cloud.