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

A website template with multilevel dropdown menus and scrolling area.

Music App project Design Credits: https://www.sketchappsources.com/free-source/2847-apple-music-app-sketch-freebie-resource.html

Embed Street view map

Travel app (Part 1) Work in progress of Travel project Credits: https://www.sketchappsources.com/free-source/2947-travel-app-ui-kit-sketch-freebie-resource.html

A project which uses Vector Animations to recreate popular social app interactions.

Simulation of scrollable Contacts list using variables (Use of variables and 'On scroll Interactions')

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.