FlexCLI is a C++/CLI interface to access NVidia Flex from .Net environments like C#, IronPython, VB etc. FlexHopper is a plugin for Grasshopper built on top of FlexCLI

Plugin for Grasshopper to stream mesh geometry through web socket.

volumetric modeling for grasshopper built on top of openvdb

Tunny with version 0. It is open source.

A Grasshopper plugin for intuitive robot programming

Parallel High-Performance Components for Rhino/Grasshopper

OpenAI API interface for Grasshopper (Rhinoceros 8)

Best-practice template for a Grasshopper and Rhino plugin using a shared library and tests

Ah... that should have been "for GH" but we're so lazy that we misspelled and didn't bother correcting.... Anyway, here's a collection of mixed-purpose user objects for Grasshopper - given "as is" (no warranty, no support) - use at your own risk (but know that we use them too... so they shouldn't explode at least)

Design Space Exploration (DSE) is a suite of open-source Grasshopper tools developed by Digital Structures at MIT. These tools aim to support visual, performance-based design space exploration and interactive multi-objective optimization (MOO) for conceptual design.

Draw the name (or nickname) of Grasshopper objects, to allow you to use the Icon Mode and have the name visible at the same time.

An open-source slicer toolkit for 3D concrete printing

A slightly opinionated starter template for Grasshopper plugin development with a variety of development aids.

Oasys GSA Grasshopper plugin

Caribou is a Grasshopper plugin for parsing downloaded Open Street Map data into Rhino geometry. Caribou is currently in beta.

2D Weighted Voronoi/Power diagrams for Grasshopper

Lightweight voxel geometry and boolean voxel operations for grasshopper

A WPF dashboard plugin for Grasshopper 3d

A Grasshopper plugin to connect with Radiance through SSH

PhysX.GH is an open source rigid body simulation tool for Grasshopper using NVIDIA PhysX