Open sources: welcome to open sources. Let's start right away with a quick quiz. First question: what do the following all have in common? Linux, Mysql, Jboss, Apache, Perl, Python, and Firefox.

GEO: connexion, May, 2007 by Gerlek, Michael P.

Yes, that was an easy one--they are all open source (OS) products, of course, and they are all well known, well respected, and widely deployed. Odds are very good you're using some of them every day, although you may not even realize it.

Second question: what do these all have in common? MapServer, MapGuide, PostGIS, GDAL, GRASS, OpenLayers, and QGIS.

Not all of these names might be familiar to you, but you probably guessed: they are all OS packages for the GIS industry--servers, web clients, desktop applications, and libraries used by thousands of geospatial professionals everyday. This column is the first of a monthly series about the power of those packages, their developers, and their users.

Why open source?

Why is open...

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