Ladybug is an open source environmental plugin originally developed for Grasshopper3D that helps architects and engineers create an environmentally-conscious architectural design. Ladybug imports standard EnergyPlus Weather files (.EPW) into Dynamo and provides a variety of 3D interactive graphics to support the decision-making process during the initial stages of design. You can do solar and solar radiation analysis as well as visualize weather and comfort data via a psychrometric chart. Here are the first intro videos: