An open-source graphic design and image-processing Grasshopper plug-in that can represent Images using different graphical techniques.

Wallacei is an evolutionary multi-objective optimization engine for Grasshopper 3D - Giving users full control over their evolutionary simulations.

Hide or show geometry in Rhino that is referenced into the Grasshopper document.

Scatter is a plug-in for grasshopper to distribute geometry with attributes. It is useful to bake large amount of objects instantly (for example

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

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

Opossum offers some of the best performing optimization algorithms in Grasshopper: model-based RBFOpt and RBFMOpt and evolutionary CMA-ES and NSGA-II.

Box2D is a 2D rigid body simulation tool for Grasshopper. It uses Box2D physics engine and a C# wrapper from colgreen/box2Dx.