Jackalope is a Grasshopper component that implements the standard Rhino space morph operations.

Mesh2Surface plug-in for 3D Reverse Engineering in Rhino. Convert scan data to CAD models with ease.

Clipper for Grasshopper and Rhino Clipper is a 2D polygon Clipper offering polygon boolean operations (clipping): Intersection, Join, Difference, X

The Surface Evolver Wrapper allows you to use Surface Evolver from Ken Brakke in Grasshopper. It contains one component which requires some geometry

A plain and simple NACA section generator for Rhino3D.

Heron is an add-on which enables the import of GIS data from various sources into the Rhino/Grasshopper environment, located, scaled and cropped

GENERATOR 2 is a smart and evolved way  to explore and iterate  generative shapes with Grasshopper®

EvoluteTools T.MAP for Rhino 5 and 6 provides re-meshing using pure quad or triangle meshes, and texture mapping using quad or triangle patterns