Hy-Stone is the software used for analyses on rockfall. It allows the execution of "physically based" 3D models with the following features:

• 3D simulation of free-fall, impact, and rolling of non-interacting blocks on a topography derived from the DEM (no resolution limit).
• Hybrid kinematic (free-fall) and dynamic (impact and rolling) approach with various available contact functions.
• Stochastic approach: DEM resolution + pseudo-random variation of parameters.
• Impact on structures (e.g., buildings, barriers, embankments, tunnels) and trees.
• Input and output in raster and vector GIS-compatible formats.
• Analytical capabilities at different scales.
• Graphic User Interface (GUI) in a GIS environment.