Download of saga-8.1.3_x64.zip (saga-8.1.3_x64.zip ( external link: SF.net): 90,402,827 octetos) will begin shortly. If not so, click link on the left.
SAGA - System for Automated Geoscientific Analyses - is a Geographic Information System (GIS) software with immense capabilities for geodata processing and analysis. SAGA is programmed in the object oriented C++ language and supports the implementation of new functions with a very effective Application Programming Interface (API). Functions are organised as modules in framework independent Module Libraries and can be accessed via SAGA’s Graphical User Interface (GUI) or various scripting environments (shell scripts, Python, R, ...).
Have a look at the SAGA web site for more details.
