I am a designer with 20 years of experience. I've tried contributing to FOSS, but the developers are incredibly stubborn and work purely guided by their own assumptions. Hence the horrible UX on so much FOSS. There are more than enough design people that would love to contribute, but are met with nothing but ridicule and insults.
Although you still need windows, Rhino3D is amazing and has a perpetual license. It's way cheaper if you are studying or teaching. There is also sketchup which works through the browser but I don't know if that works on Linux.
Mark Strand - Keeping things whole. It helps me deal with depression. I find it very soothing when I'm feeling down. It's one of the few I know by heart.
The greasy strangler.