LiteCAD是一款建议的CAD软件，提供二次开发SDK，LiteCAD.dll为CAD控件，用户可以快速的定制自己的CAD软件界面，开发文档详细，可以自定义命令以及事件响应函数，支持语言配置(LiteCAD CAD is a software that provides two times, the development of SDK, LiteCAD.dll for the CAD control, the user can quickly customize CAD software development interface, detailed documentation, customize the commands and event response function, configuration language support)