I'm researching Open Source GIS resources - and wonder out of all the Open Source tools that are out there - what people are actually using / finding useful.
http://en.wikipedia.org/wiki/GIS_software
QGIS is a free and open source GIS software licensed under the GNU General Public License. QGIS is an official project of the Open Source Geospatial Foundation (OSGeo). It is a cross-platform GIS solution, supporting a variety of operating systems like Linux, Mac OSX, Windows and Android.
QGIS is one of the most powerful open source GIS software packages available for free… And plugins are the key to its success. In terms of remote sensing plugins, the semi-automatic classification plugin is one of the best.
QGIS (Quantum Geographic Information System) is a free, open-source software that allows users to create, edit, visualize, analyze, and publish geospatial information.
gvSIG is one of the only open-source GIS platforms with a native mobile app for Android. This makes it a great option anyone who needs to collect data or create maps in the field.
Here's a few I use regularly
Big list here http://opensourcegis.org/
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