There are two options for downloading the MegaPack, a torrent and a link for direct download. Metal Ladders CAD Drawings Free Architectural CAD drawings and blocks for download in dwg or pdf formats for use with AutoCAD and other 2D and 3D design software. SmartDraw's CAD drafting software is uniquely powerful and easy to use. Free cad files Architects and urban planners use Cadmapper to save hours of routine drawing.