A mix of favourite and interesting plugins for Grasshopper.

Energy and building simulation

Ladybug and Honeybee Import EPW files, solar radiation analysis, daylight calculations, thermal calculations
Diva for Rhino Daylight calculations
mr comfy Thermal and daylight calculations

Geometry

Jackalope Rhino morph operations
Lunchbox Convert surfaces to panels
MeshEdit Essential mesh manipulation tools

Workflow

Octopus Multi-objective optimisation
Lunchbox Read and write to Excel
GeometryGym Move geometry between different BIM/analysis file formats
Firefly Arduino control and internet data control
Mosquito Facebook, Twitter and Google Maps queries

Visualisation

Giulo Piacentino’s renderAnimation Generate frames for animation
Horster Control Rhino camera

Mapping

Elk Process OpenStreetMap OSM data and USGS HGT height data

…and of course there is the Food4Rhino directory for the full list of the most popular components.