Hi Eyal,

gEDA is free electronics design suite for Linux. It's got amazing functionality.
With the PCB module you can create layouts and save them in the gerber format.
If you want to convert DXF files to gerber, there's Linkcad, which is commercial
but the demo may be usable.

Regards,
Wouter

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Dr. Wouter Meuleman
Senior Research Scientist
Oxamer Business Unit
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