http://www.openscad.org/documentation.html
Hello, I am Mechanical Engineering student at Michigan Tech. I am currently in the MY4777 Open-Source 3D Printing class, where we are building Delta Reprap 3D printers, and modeling designs using primarily OpenSCAD and FreeCAD. Please feel free to drop me a line Webpages: LinkedIn, Thingiverse, Youmagine, Libre3, GrabCAD, RepRap wiki