Kangaroo is a Live Physics engine for interactive simulation, form-finding, optimisation and constraint solving.

Ladybug Tools is a collection of open source computer applications that support environmental design and education.

Use the same flexible language everywhere: GhPython is the Python interpreter component for GH that allows to execute dynamic scripts.

Elk is a set of tools to generate map and topographical surfaces using open source data from OpenStreetMap.org and USGS.   OpenStreetMap.or

Paneling solutions from concept to fabrication. Generate 2D and 3D cellular patterns over rectangular grids.

Meshedit is a set of components which extend Grasshopper's ability to work with meshes.     included components: utilities:

The Pufferfish is one of few animals which is capable of changing its shape. This plugin focuses on Tweens, Blends, Morphs, Averages & Interpolations.

Welcome to Human for Grasshopper! Human extends Grasshopper's ability to create and reference geometry including lights, blocks, and text objects.