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Engineer4Free is proud to offer all of its content for free, but relies significantly on voluntary user donations. If you believe in its mission or are an active user, pay what you can. Even if it's $2.99/month: the price of a cup of coffee, or $3.14: the magical number of pi, it makes this project possible when we all do it. We are more than happy to refund your last payment if you decide supporting Engineer4Free is not right for you.
Let's make Engineering Education accessible to the world.