Linux isn’t known for having many professional-grade linear drawing and engineering design tools.
Dassault’s DraftSight is the only choice in that part, but paying a few hundred bucks is maybe not the best option for everybody out there. Thankfully, the rich world of free software isn’t leaving us alone in this sector either, and one of the most popular solutions to help you get your designs ready is the amazing LibreCAD. It may not be as sophisticated as other well-known tools, and it may not boast the time-saving features of commercial solutions, but it will certainly do the job in most cases. Here is a guide on how to get started with it and how to design a round flange with drill holes.