QGIS is one of the few open-source GIS app you can easily install on most operating systems. Technically though, all open source apps can be installed on any operating system since the source is available to everyone. However, the QGIS community is doing an enormous effort to provide easy installers and binaries to almost every operating system in the planet.
QGIS on several platforms. Clockwise from upper-left: Ubuntu Linux 11.04 via ssh; Windows XP in VirtualBox; Mac OSX Leopard and; Android Tablet (2.3 “Gingerbread”).
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