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But I would argue that the reason for your disappointment has nothing to do with the licensing of the product-drop-in replacements for complex programs with long-time users who have specific needs and expectations for their software are hard. Let's start by being honest and upfront about something: If you're looking for a drop-in replacement for your existing CAD program that will provide identical functionality and workflow without making any changes to your processes, you're going to be disappointed. So how do the open source alternatives to AutoCAD stack up? The answer depends on how you plan to use them.
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