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A free cad system known as Design Spark is offered by Radio Spares. This is quite comprehensive. A popular system for downloading is CadSoft (Eagle) which has a free version. Protel (Altium) is a professional system, though the Protel DOS version is probably still available for free, and suits hobbyists particularly. Mentor Graphics is at the high end of the market with features for integrated circuit layout on chips.
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