This document discusses the history and capabilities of GRASS GIS, an open source geospatial software suite. GRASS was first developed in 1984 and continues to be improved through contributions from its development team and user community. It provides tools for geospatial data management, spatial modeling, map production, spatial analysis, and visualization. GRASS can process large LIDAR datasets, connect to external data sources, perform 3D modeling and visualization, and is increasingly integrated with web-based tools and programming interfaces like Python.