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
