What computer software is used to create CAD drawings?

anonymous asked: Specifically, two-dimensional CAD drawings that can be drawn to scale. Below is an example of one (click on the download link to view the plans):
http://www.littlemachineshop.com/Projects/OscillatingEngine.php
I already know that this is a PDF file, but what is the name of the software used to create these plans? Also, what are some more software programs [...]

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