With Remap+, you can scale a series of numbers from their original range to a new range by defining the minimum and maximum values of the target domain.

PRKNG_sqr [Parking Square] calculates the parking stall layout on any given boundary in real-time utilizing a square grid system.

Just an usual mesh pipe and mesh sweep. Find both in Mesh->Primitive panel.

Culebra.NET is a 2D|3D Multi Object Behavior library written in C# (Wrapper around Culebra Java library) focused on hybrid system interactions with custom Visualization, Data, and performance features. It contains a collection of objects and behaviors for creating dynamic multi agent interactions. For more information see the Culebra Java Library.

Bowerbird is a plugin for Grasshopper which provides tools for modeling. It provides components to create waffle and layer models, a single-line font for labeling with laser cutter and milling.

Additionally if you are interested in the research behind Ivy you can read these two papers. Please consider citing them if ivy helps you in your research and up-vote the plug-in if it is helpful for your work.

Spider is a Grasshopper plugin written in C#.  It focuses on the structural form-finding method that can simulate different models of hanging chains.

This toolkit focuses on the versatile nature of meshes, providing various effective functionalities for working with and editing mesh topology. Heavily inspired and driven by the concept of edge loops (thank you, Autodesk Maya and Pixologic ZBrush), the organizational data structure behind mesh construction provides a plethora of design possibilities, some of which are still being discovered today.

Wombat for GH is an open source series of miscellaneous utilities aimed at improving modeling processes by streamlining common tasks. It includes components for operating on geometry, lists, files and folders, and visualizing the geometric properties of surfaces and meshes. Originally developed by Andrew Heumann and Brian Ringley while members of the Woods Bagot Design Technology team, maintained by WB DT. Open source at https://github.com/woodsbagot/WombatGH

ShapeMap is a plugin for Grasshopper, developed by the McNeel Asia China team. It integrates multiple basic functions in Rhino and has undergone secondary development. This plugin allows users to map any curve texture designed on a plane onto the surfaces of complex 3D models, while minimizing or eliminating deformation of the texture curves on the 3D surfaces. With ShapeMap, designing textures on 3D model surfaces becomes much easier, and the operation process is intuitive and simple.

Firefly offers a set of software tools dedicated to bridging the gap between Grasshopper (a free plug-in for Rhino) and micro-controllers like the Arduino. It allows near real-time data flow between the digital and physical worlds – enabling the possibility to explore virtual and physical prototypes with unprecedented fluidity.

Crystallon is an open source project for creating lattice structures using Rhino and Grasshopper3D. Each tool is left as a cluster which can be opened and modified at will, in the spirit of open source. We hope the community will continue to develop and contribute to Crystallon through the use of the Grasshopper group and Github.

The plugin consists of a multithreaded simulation core and a set of tools for defining particle behaviors as well as their environment. Nuclei features unique voxel implementations for a powerful approach where particles adapt their behavior based on the highly customizable environment.

Rooster is a plugin useful for extracting curves from images; a process commonly known as Vectorization of an image

The voxeltools offer lightweight voxel geometry for Rhino. It allows you to quickly generate and manipulate voxelated geometry from meshes, breps, curves and points, and offers boolean operation between voxelgrids. It can convert voxelgrids to solid mesh hulls.

FractureHopper is an extension of GH for fractal math and chaos theory. It extens grasshopper with a number of utilities: Julia 2D and 3D sets and tests, Lorenz attractors, Rabinovich-Fabrikant maps, Bifurcation diagrams.

Draw the name (or nickname) of Grasshopper objects with Draw Icons mode on. It also enriches the capsules when you zoom in to understand the component and visualise its data at a quick glance and you can display the group nicknames filling its box when the zoom is too low.

Mesh NGon for Grasshopper: NGon Create, Vertex, Edge, Face Adjacency queries, Subdivide, Planarize, Transform, Utilities. Please check the example files to understand the workflow. For bugs write an email: petrasvestartas@gmail.com or post on McNeel forum.

Droid is a 3D printing related Grasshopper Plug-in Library add-on, with control over model Slicing, Custom paths and Gcode generation.