Geospiza is a plugin designed for Grasshopper that implements evolutionary algorithms, and is compatible with headless Rhino environments eg. rhino.compute.
OctoMass is a grasshopper provides a set of parametric design tools that can be used to create building mass alternatives and evaluate some simulation data results.
The Visual Tracer extension for Grasshopper is a revolutionary tool for the analysis and visualization of spatial visual qualities within digital environments.