Source Wireframe Kit - Library of 537 blocks for desktop and mobile prototyping
Wolfprint 3D - A 3D scanner to create realistic avatars of people for VR
Form Wireframe Kit by InVision - A free wireframe kit from InVision
Spline - Design tool for 3d web experiences
Platforma - Wireframe library of layouts and UI elements
Display.land - Capture and edit your reality from your phone