NYCityMap
The New York City Department of Information Technology and Telecommunications (DoITT) oversees the City's use of technologies in government operations, and its delivery of services to the public. DoITT developed the NYCityMap as New York City's online map portal, providing geographic information relating to infrastructure, census, and government services. NYCityMap employs GeoServer directly on top of an Oracle database, with the tiles cached and served through GeoWebCache for accelerated output.
Read the case study about DoITT's architecture.