CThruView Transparent Image Viewer - CThruView is a free transparent image viewer that allows mouse clicks to go through the image.
Whimsical Wireframes - Lightning fast wireframing with real-time collaboration.
LayerX - An intuitive app to display transparent images on screen.
Figma Map Maker - Figma plugin to generate map, supporting Google Maps, Mapbox
Osiva - Osiva" is an acronym that stands for "Overly Simple Image Viewing
Easometric Figma Plugin - With Easometric it's really easy to create isometric layers.