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

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.

RhinoPiping LT is a free piping plugin. RhinoPiping Pro has many additional features, including Ifc export for AEC, and multiple iso generator (Pro+)

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

The Waterman Polyhedra plug-in for Rhino will allow you to Waterman Polyhedrons.

LastElf is a 3D digital last design software base on Rhinoceros. Not only for mass production but also target on small quantity and variety fashion