Source Wireframe Kit - Library of 537 blocks for desktop and mobile prototyping
Webflow 3D Transforms - Build 3D interactions visually, without writing any code
Form Wireframe Kit by InVision - A free wireframe kit from InVision
Tridiv - Web-based editor for creating 3D shapes in CSS
iOS Wireframing UX Kit - An easy, speedy way to wireframe for iOS
iMeshup - Import, edit and share your 3D projects via web and mobile