QGIS
QGIS (Quantum GIS) is a free, open-source geographic information system (GIS) software used for viewing, editing, analyzing, and visualizing spatial data. It supports a wide range of vector, raster, and database formats, enabling users to create maps, perform spatial analysis, and manage geospatial data. It is widely used in fields like environmental science, urban planning, and cartography.
Developers should learn QGIS when working on projects involving geospatial data, such as mapping applications, location-based services, or environmental monitoring systems. It is particularly useful for tasks like data preprocessing, spatial analysis, and creating visualizations, making it essential for roles in GIS development, data science with spatial components, or any application requiring geographic context.