Euclid is a free and open-source extension for SketchUp that makes it easy to create and modify the geometry inputs for building energy models. Euclid builds on the Legacy OpenStudio extension originally developed by the National Renewable Energy Laboratory (NREL). Because NREL no longer supports Legacy OpenStudio, Big Ladder Software has taken over maintenance, development, and support of the extension–now renamed as Euclid.
https://bigladdersoftware.com/projects/euclid
OpenStudio® is a cross-platform (Windows, Mac, and Linux) collection of software tools to support whole building energy modeling using EnergyPlus and advanced daylight analysis using Radiance. OpenStudio is an open source (LGPL) project to facilitate community development, extension, and private sector adoption. OpenStudio includes graphical interfaces along with a Software Development Kit (SDK).
https://www.openstudio.net
