The Ladybug Tools (LBT) Plugin for Grasshopper includes a wide range of building simulation capabilities that support environmental design. It is composed of a few hundred Grasshopper components, which are organized into different insects, each of which is specialized in a particular set of capabilities.
Documentation
Ladybug - Weather data analysis and visualization.
Honeybee - Detailed modeling of buildings in various simulation engines.
HB-Radiance - Radiance simulation (daylight, radiation, glare/visual comfort).
HB-Energy - E+/OpenStudio simulation (energy use, HVAC sizing, thermal comfort).
Dragonfly - Abstracted modeling of large buildings and urban districts.
Ironbug - Detailed HVAC and SHW system modeling for Honeybee and Dragonfly.
Fairyfly - Performance models of construction details (eg.THERM simulation).
Installation
For Windows, the easiest way to install is by creating a Pollination account and downloading the free Pollination Grasshopper single-click installer. The installer comes complete with the latest version of LBT-Grasshopper along with a compatible version of all required simulation engines.
For Mac and alternative installation pathways, see the lbt-grasshopper wiki for instructions on how to install the Grasshopper plugin.
Sample Files
All regularly-updated sample files for the LBT Grasshopper plugin are included in the LBT-Samples Repository and are also accessible via the LB Samples Grasshopper component.