CAD freeware for customer IC design

Does Windows 10 or Linux (Centos?) CAD freeware exist for IC transistor layout?

By IC transistor layout I mean it would understand poly crossing over diffusion as being an xtor and a M1 layer crossing over the M2 layer would, for example, be an electrical short.

(Otherwise it's just normal 2D CAD graphics.)

TIA

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CraZe
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