I used the Sketch "Delicious" free UI Kit for a food recipes app. It includes 11 pixel-perfect screens. I just added Proto.io interactions and created a great prototype! This Delicious UI Kit was designed by Robert Anitei Sketch source: https://www.sketchappsources.com/free-source/1765-delicious-ui-kit-sketch-freebie-resource.html

Infinite snap carousel for Credit Card Statements. Cards designs were used from Sketch from: https://www.sketchappsources.com/free-source/2453-credit-card-designs-sketch-freebie-resource.html

A 3D Interactive Walkthrough of a space using the Proto.io VR Component. Using gaze click interactions you can transition from one 360° scene to another. Import this fully editable project into your Proto.io account to create your own 3D interactive walkthrough.