Is it there an open-source free CAD to design stl. files for 3D printers hosts?

Hello Community,
Thank you for accepting me here. I’m looking forward to use Linux Mint 20 in all possible tasks and endeavors that I can during the rest of my life. I’m 66 years old-timer. I am a maker of 3D printers and drones though my background is more that of a self-made tech builder, counting with the help of open sources, tutorial sites, and videos on the net.
Since I’m not a one skilled like you guys and have tried to run solid-works with wine on Linux Mint with no success, I would like to know if there is an open-source free CAD to design stl. files for 3D printers hosts such as Repetier or Ponterface. Your suggestions will be greatly appreciated. Victor

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