For the 3D side, here's one from our team: Quady3D. It turns a reference image into a model you can preview and take into Blender—handy for trying a prop idea before spending ages modeling it.
I'd treat the output as a starting mesh, not a finished game asset. Check the back/underside, scale and textures, then test it in your engine.
We're Quady3D AI, so this is a maker's contribution, not an independent recommendation. Generation uses credits; full AI model downloads require a paid pack or subscription. Writing is AI-assisted.