Geographic Resources Analysis Support System, commonly referred to as GRASS GIS, is a Geographic Information System (GIS) used for data management, image processing, graphics production, spatial modelling, and visualization of many types of data. GRASS supports raster and vector data in two and three dimensions. The vector data model is topological, meaning that areas are defined by boundaries and centroids; boundaries cannot overlap within a single layer.
 
GRASS GIS contains over 350 modules to render maps and images on monitor and paper; manipulate raster, and vector data including vector networks; process multispectral image data; and create, manage, and store spatial data. GRASS GIS offers both an intuitive graphical user interface as well as command line syntax for ease of operations. GRASS GIS can interface with printers, plotters, digitizers, and databases to develop new data as well as manage existing data.

Geographic Resources Analysis Support System, commonly referred to as GRASS GIS, is a Geographic Information System (GIS) used for data management, image processing, graphics production, spatial modelling, and visualization of many types of data. GRASS supports raster and vector data in two and three dimensions. The vector data model is topological, meaning that areas are defined by boundaries and centroids; boundaries cannot overlap within a single layer.

GRASS GIS - Geographic Resources Analysis Support System

QGIS is an Open Source Geographic Information System. QGIS aims to be an easy to use GIS, providing common functions and features. The initial goal was to provide a GIS data viewer. QGIS has reached that point in its evolution and is being used by many for their daily GIS data viewing and editing needs. QGIS supports a number of raster and vector data formats, with new support easily added using the plugin architecture.
 
QGIS provides a continously growing number of capabilities provided by core functions and plugins. You can visualize, manage, edit, analyse data, and compose printable maps.

QGIS is an Open Source Geographic Information System. QGIS aims to be an easy to use GIS, providing common functions and features. The initial goal was to provide a GIS data viewer. QGIS has reached that point in its evolution and is being used by many for their daily GIS data viewing and editing needs. QGIS supports a number of raster and vector data formats, with new support easily added using the plugin architecture.

QGIS - Geographical Information System (GIS)

Whitebox GAT is an open-source geographical information system (GIS) and remote sensing package. The Whitebox GAT project began in 2009 and was conceived as a replacement for the Terrain Analysis System (TAS). Whitebox GAT is intended to provide a platform for advanced geospatial data analysis with applications in both environmental research and the geomatics industry more broadly.
 
It was envisioned from the outset as providing an ideal platform for experimenting with novel geospatial analysis methods. Equally important is the project’s goal of providing a tool that can be used for geomatics-based education.

Whitebox GAT is an open-source geographical information system (GIS) and remote sensing package. The Whitebox GAT project began in 2009 and was conceived as a replacement for the Terrain Analysis System (TAS).  Whitebox GAT is intended to provide a platform for advanced geospatial data analysis with applications in both environmental research and the geomatics industry more broadly.

Whitebox Geospatial Analysis Tools - An open-source GIS and remote sensing package

SAGA is a free geographic information system (GIS), with a special 'Application Programming Interface' (API) for geographic data processing. This API makes it easy to implement new algorithms. The SAGA API supports grid data, vector data, and tables. It has been designed for an easy and effective implementation of spatial algorithms.
 
It supports far more than 450 freely available functions for geodata analysis, Georeferencing and cartographic projections, Geostatistics: GWR, variograms, ordinary & universal Kriging and lot more.

SAGA is a free geographic information system (GIS), with a special 'Application Programming Interface' (API) for geographic data processing. This API makes it easy to implement new algorithms. The SAGA API supports grid data, vector data, and tables. It has been designed for an easy and effective implementation of spatial algorithms.

SAGA GIS - System for Automated Geoscientific Analyses

MapWinGIS.ocx is a C++ based GIS programming ActiveX Control and API that can be added to a Windows Form in VB, C#, Delphi, etc. providing your app with a map.

MapWinGIS - ActiveX Map and GIS Component

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GRASS GIS - Geographic Resources Analysis Support System

QGIS - Geographical Information System (GIS)

Whitebox Geospatial Analysis Tools - An open-source GIS and remote sensing package

SAGA GIS - System for Automated Geoscientific Analyses

MapWinGIS - ActiveX Map and GIS Component

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GRASS GIS - Geographic Resources Analysis Support System

QGIS - Geographical Information System (GIS)

Whitebox Geospatial Analysis Tools - An open-source GIS and remote sensing package

SAGA GIS - System for Automated Geoscientific Analyses

MapWinGIS - ActiveX Map and GIS Component

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