LibreCAD是开源的跨平台的2D CAD 制图软件，它是基于社区版本 QCad 构建，使用C++开发，基于Qt。支持 Mac OSX, Windows 和 Linux系统 。LibreCAD的功能和AutoCAD差不多，能够完成基本的绘图工作。
LibreCAD源代码：https://github.com/LibreCAD/LibreCAD/
LibreCAD is a cross-platform 2D CAD program written in C++11 using the Qt framework. It can read DXF and DWG files and can write DXF, PDF and SVG files. The user interface is highly customizable, and has dozens of translations.
Ubuntu安装LibreCAD：
$ sudo add-apt-repository ppa:librecad-dev/librecad-daily
$ sudo apt-get update
$ sudo apt-get install librecad
LibreCAD安装及使用截图：
