SAGA GIS

The ease with which one can perform geospatial data analysis on variable projection systems and represent data using a very user-friendly GUI where you can open multiple windows at once are some of the best features of SAGA GIS.

SAGA GIS is an open-source software used for geospatial technology. SAGA GIS has various ready-to-use tools such as terrain analysis, hydrology analysis, fire spread analysis, etc. SAGA GIS has a GUI software application as well as a Python API.

The amount of features available is enormous, you can use raster and spatial information from many formats, like the common shapefile, or even .tab files or files from Grass or similar software, you can open virtually any type of raster image, no matter the extension or the data, you have hundreds of options to visualize your data together or individually, the software runs smooth and the interphase is nice.