ASCON offers a free version of its professional MCAD solution, KOMPAS-3D LT.
Its 3D portion is functionally-reduced, 'natch, but includes 2D Drafting and Design and 12 lessons; all that's lacking is 3D assembly modeling. (Commercial use is prohibited.)
To download KOMPAS-3D LT, register at ascon.net/download.php?dl=305.
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