Openstudio 2.9.1 ((free)) -

For modern developers, OpenStudio 2.9.1 is often deployed using . This ensures a consistent environment regardless of the host operating system.

(the U.S. Department of Energy’s flagship building energy simulation engine) and (for daylighting analysis). National Laboratory of the Rockies (NLR) (.gov) openstudio 2.9.1

April 13, 2026 (Retrospective Analysis) Software: OpenStudio Version: 2.9.1 Release Date: Approximately December 2020 – January 2021 Platform: Windows, macOS, Linux For modern developers, OpenStudio 2

, version 2.9.1 represents the final chapter of the traditional "v2.x" era of the OpenStudio software development kit (SDK) before the major pivot to version 3.0. Department of Energy (.gov) For modern developers