QCad is a good, trial version software also available for Mac, that is part of the category Design & photography software with subcategory 3D Design (more specifically CAD) and has been created by Ribbonsoft.
More about QCad
QCad is a program that will require less storage space than most software in the section Design & photography software. It's very heavily used in many countries such as India, Australia, and Turkey.
Since the software was added to our catalog in 2011, it has managed to reach 71,007 installations, and last week it gained 7 downloads.
It's available for users with the operating system Windows 95 and former versions, and you can download it only in English. The current version of the program is 3.3.0 and it has been updated on 9/17/2013.