I really, really like Blender. I use it only as a hobbyist, but pretty reliably once a year it's super useful - modeling furniture in my apartment before moving

I really, really like Blender. I use it only as a hobbyist, but pretty reliably once a year it's super useful - modeling furniture in my apartment before moving, making visualizations, even playing with little artistic ideas. Contrary to some other comments here, I like the interface. My only experience with competing software was ~8 years ago, but I find blender's interface faster and intuitive once you get over a slight learning hump.