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I'm looking for famous companies / "big names" (like army , goverments , city halls) that chose to use open source map servers and not paid solution like ESRI and such for presentation I'm doing (go Open Source :) )


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4 has a list of clients for its services offering (which is basically all open-source product based). There is more detail in their gallery: – BradHards Jan 26 '13 at 23:33
@BradHards - I think you should turn your Comment into an Answer – PolyGeo Jan 28 '13 at 23:00
@PolyGeo: It seemed a bit superficial to be a proper answer. I'd prefer answers contained content rather than links... – BradHards Jan 29 '13 at 4:44
@BradHards - just as a link that Answer would be almost as long as the Question;-) – PolyGeo Jan 29 '13 at 6:02

I work for Ordnance Survey, Great Britain's National Mapping Agency, and we use GeoServer for our web Map Service, OS OnDemand.

We also use PostgreSQL and PostGIS to store our vector data.

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A famous name in education would be Harvard University using QGIS:

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