Dassault Systèmes’ DraftSight is the closest clone to AutoCAD 2009. It uses the familiar .dwg format, has a near-identical command line, and offers a free version for personal and non-commercial use. The interface resembles the "AutoCAD Classic" workspace perfectly.
AutoCAD 2009 uses the DWG 2009 file format. While modern AutoCAD versions can open these files, saving back to this format is sometimes necessary when collaborating with firms using older infrastructure.
One of the primary reasons users search for an is to install it on older hardware. Unlike modern versions (AutoCAD 2024/2025) that require high-end multi-core processors and massive amounts of RAM, AutoCAD 2009 was built for a different era.