GstarCAD - Fast, Powerful and DWG-Compatible CAD Software GstarCAD is the fast, powerful and DWG-compatible CAD software. It is the world-class 2D/3D CAD (Computer aided design) software platform based on IntelliCAD technology. GstarCAD's powerful functions, AutoCAD-compatible programming platform, cost-effective solution and ease-of-use operating interface ensure that your design inspiration comes true skillfully and thoroughly at high speed.