SketchTool - Export pages & slices out of .sketch docs using CLI
Kaedim - Use the Kaedim Platform to automatically transform your 2D art, sketches and photos in 3D.
Select Similar Layers - Sketch plugin to select layers with the same attributes
Spline - Design tool for 3d web experiences
Base UI Sketch Framework - Huge set of everything you need to design and prototype
Vectary - Vectary is a free, online 3D modeling tool and sharing platform.