CThruView Transparent Image Viewer - CThruView is a free transparent image viewer that allows mouse clicks to go through the image.
Anima App - Design, get feedback, convert to code, publish, iterate.
LayerX - An intuitive app to display transparent images on screen.
Sketch Repo - Collection of resources for anyone who uses Sketch
Overlay - Overlay transforms Figma and Sketch designs into reusable React, Vue.js components
Git Sketch Plugin - Version control for designers