Archimedes is a free and open source CAD (Computer Aided Design) software. It is a robust system built over Eclipse’s Rich Client Java Platform fully based on plug ins. This means it is easily extensible but also has a pretty thin core that allows you to select the features you need and drop the other ones easily.
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The project seems no longer developed. Last version, 0.66, released in June 2012, can be still downloaded from SourceForge.