LibreCAD is a free Open Source CAD application for Windows, Apple and Linux. As this is only a 2D package, you are slightly more limited in what you are able to use LibreCAD for, but there is still the potential for using it drawing different views of an object. There is also support for layers so you can create exploded views of object to compensate for the lack of 3D and there are all manner of drawing tools on hand to enable you to get down exactly what you need.
[advt]Options such as snapping and grouping make it easy to create objects that can be moved around en masse. Dimensions units can be adjusted to account for scale and country. Completed designs can be exported in a variety of formats including image like JPG and TIF, and other such as PPM and XBM.
If you have never used a CAD package before, LibreCAD may not be the best starting point as you are rather thrown in at the deep end. Despite being a feature complete product neither the program itself nor its web site contain anything even approaching a useful help file or manual and the wiki page are somewhat sparse.
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