I've had some free time recently, some of which I'm been putting into watching YouTube videos on how to use Blender. It's a very complete 3D modelling package, but also quite complicated to learn how to use.
However, I've started to figure out the basics, and in the process have started working on some 3D models of various spacecraft designs for my various SciFi RPG initiatives. I'm very much at beginner level at the moment though, so anything I produce is very basic. I'm making everything I do available under open source licenses, and available on GitLab.
I've also tried some crude scenes as well, though drawing natural stuff is a lot harder than engineered objects. Hopefully things will improve over the coming year, and I may try using it for fantasy related things as well (such as buildings and ruins).