UI8 - Carefully crafted UI design assets
CThruView Transparent Image Viewer - CThruView is a free transparent image viewer that allows mouse clicks to go through the image.
Handsome Illustrations - Create unique illustrations for websites & applications.
LayerX - An intuitive app to display transparent images on screen.
Ouch! Illustrations by Icons8 - Professional, perfectly matching, and customizable illustrations for any designs
Osiva - Osiva" is an acronym that stands for "Overly Simple Image Viewing