A visual programming plugin for Rhino widely used for parametric and generative design in architecture and computational BIM workflows. Like Dynamo for Revit, Grasshopper lets designers wire together nodes instead of writing code to generate and control complex geometry - facades, structural optimization, form-finding - parametrically. It's especially dominant in early-stage conceptual design and competition work, where Rhino's freeform modeling is often preferred to Revit's more constrained tools.