Spline - Design tool for 3d web experiences
Shapefest - A massive library of 3D shapes for everything!
Webflow 3D Transforms - Build 3D interactions visually, without writing any code
Wannathis - 3d illustrations and freebies
Vectary - Vectary is a free, online 3D modeling tool and sharing platform.
Craftwork - A collection of User Interface resources made by Craftwork