Linux下的开源软件QCAD完整源代码，方便需要编制类CAD/CAM程序-Linux open-source software QCAD integrity of the source code, the need to facilitate the preparation of CAD / CAM processes

演示一段飞机飞行的三维动画，利用openGL库的C++语言实现-A flight demonstration of the three-dimensional animation, using openGL library of C++ language implementation

QCad 是2D CAD 程序 Linux-QCad version 2.x. QCad is a simple 2D CAD program which runs under Linux, Windows, Mac OS X and several Unix systems.