4. Saga
Supported OS: Windows 2000 and newer, Linux, Free BSD
Saga (System for Automated Geoscientific Analyses), the next on our list of easiest free GIS software is one of the user-friendly open source GIS software that offers a wide range of spatial manipulation tools, with user-friendly interface and many visualization options. It is widely being used by geoscientists and is suitable for fast and accurate terrain analysis.
