GCut is a modeling and sculpting add-on that utilizes Grease Pencil and annotation strokes to generate and modify 3D forms. It provides a suite of tools for cutting, shaping, and building volumes based on drawn curves. The toolset includes features for converting annotations to Grease Pencil objects, mirroring and slicing geometry along standard axes, and generating tubes or curves from strokes. It also offers operations for beveling, smoothing curves, and creating procedural holes, enabling rapid concepting and shape exploration.