SAGA GIS - System for Automated Geoscientific Analyses

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.