Free cross-platform desktop geographic information system application that supports viewing, editing, and analysis of geospatial data.
QGIS is a free and open-source cross-platform desktop geographic information system application that supports viewing, editing, and analysis of geospatial data. Create, edit, visualise, analyse and publish geospatial information on Windows, Mac, Linux, BSD (Android coming soon).
You can view and overlay vector and raster data in different formats and projections without conversion to an internal or common format.
Explore data and compose maps
You can compose maps and interactively explore spatial data with a friendly GUI.
Create, edit, manage and export data
You can create, edit, manage and export vector and raster layers in several formats.
You can perform spatial data analysis on spatial databases and other OGR- supported formats. QGIS currently offers vector analysis, sampling, geoprocessing, geometry and database management tools.
Publish maps on the Internet
QGIS can be used as a WMS, WMTS, WMS-C or WFS and WFS-T client, and as a WMS, WCS or WFS server. (See section Working with OGC Data.) Additionally, you can publish your data on the Internet using a webserver with UMN MapServer or GeoServer installed.
Extend QGIS functionality through plugins
QGIS can be adapted to your special needs with the extensible plugin architecture and libraries that can be used to create plugins. You can even create new applications with C++ or Python!