As a fellow linux users and 3D printing newbie: - Tinkercad (browser) fun and great for very simple projects. Like the MS Paint of 3D. - OnShape (browser) see

As a fellow linux users and 3D printing newbie: - Tinkercad (browser) fun and great for very simple projects. Like the MS Paint of 3D. - OnShape (browser) seemingly pretty powerful, but not the easiest to learn in my experience, and has some annoying bugs. - Plasticity (desktop) I played around with the free trial and liked it a lot, found it more intuitive than OnShape. - Womp (browser) not CAD software, but easy to use and great for making free-form/organic looking designs. - Blender (desktop) not CAD software and haven't used it myself, but I've seen others use it to design 3D prints.