PostgreSQL server is an open source object relational database management system. On similar lines of ESRI’s ArcSDE and Oracle’s spatial extension, PostgreSQL can serve as a back end spatial database for Geographic Information Systems (GIS) by making use of the PostGIS extension, which was developed Refractions Research as a project under the open source spatial database technology and released under the GNU General Public License.
zigGIS on the other hand is a Google product was developed by Abe Gillspie, Paolo Corti and Bill Dollins who are the founders of Obtuse Software which focuses on the development and improvement of zigGIS, which is essentially an ArcGIS plug-in for loading and viewing PostGIS layers from the PostgreSQL server. For more information on zigGIS, go to the official website at http://code.google.com/p/ziggis/ http://www.obtusesoft.com/.
Note: The code for past versions of zigGIS was hosted at http://code.google.com, which hosts open-source projects.
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Just a point of accuracy. ziGIS is not a Google product. The code for previous versions was hosted at code.google.com, which exists to host open-source projects, but it is not affiliated with Google.
Bill Dollins
Apologies for my ignorance. I regret for not having researched enough on zigGIS before making a post and sending out ambiguous information.