Ready to be published? LXer is read by around 350,000 individuals each month, and is an excellent place for you to publish your ideas, thoughts, reviews, complaints, etc. Do you have something to say to the Linux community?
QGIS is a free and open source geographic information system (GIS) that is extensible, interoperable with other GISes, and used by a ton of people (including me) who have geographic data to analyze and visualize. It's a great platform with an enormous set of capabilities, which can seem daunting on first approach.
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