On The Rocks is a Blender addon from Dennis Hafemann for building decorative rock formations, bricks, walls, walkpaths, damages, landscapes, crystals and fractures. Every tool runs on Geometry Nodes, so each comes with settings for size, rotation, randomization, edges, detailing and noising. Effects can be drawn by free hand, generated from curves, or applied to existing mesh objects.
The addon packs 12 tools and modifiers: Pillar Formation, Rock Formation, Bricks Walls, Edge Damage, Surface Erosion, Rock Creation, Surface Fracture, Cell Fracture, Rock Scattering, Landscapes, Volumization and Crystals Formation. Landscapes can generate rocky mountains, watery islands or deserts with clouds, ocean and ripples, while Volumization converts a mesh through a mesh-volume-mesh step into rocky objects. Crystals Formation is also available as a standalone Geometry Nodes modifier.
A second addon, On The Rocks Assets, imports high-poly photo-scanned stones and rocks with 4K textures and is an ongrowing library. Both ship as ZIP files installed as Blender addons, and modeled presets with materials are included. A demo video is available.