Instance_Manager is a part of Heteroptera Plugin that is specified to manage Block-Definition and instances in Rhino from Grasshopper.
Analysis Tools for Rhino
FractureHopper is an extension of GH for fractal math and chaos theory.
Plug-in to export some Rhino 5 objects to SVG
RhinoCFD adds the power of computational fluid dynamics to the CAD environment, allowing users of Rhino3d to undertake CFD investigation