I hope the “Donald Trump Baby Blimp” makes an appearance at every place he visits :)

They exist. Go on a Steam discussions page for a popular game that doesn’t currently support Linux, and create a new post politely asking about the possibility of Linux support.

*A wild WINDOWS ZEALOT appears*

This is good, but how do I keep my data safe from cats?

or a selection of CEOs, perhaps?

I think everyone’s got the CAD/3D programs covered, so a slightly “out there” answer:

If you’re just doing 2D blueprints for yourself, do you actually just need a 2D vector program for doing a scale drawing with measurements?

I’ve done a lot of floorplans / layouts/ site maps etc using Inkscape, for instance.

It depends on exactly what you’re wanting out the other end - so you may be lacking a lot of the features in a full CAD program, but the learning curve is comparatively so shallow that you might have a working plan by the end of the day, rather than the end of the month.