Previewed - Beautiful mockups & graphics for your next app
CThruView Transparent Image Viewer - CThruView is a free transparent image viewer that allows mouse clicks to go through the image.
Mock - Instantly create video mockups from screen recordings
LayerX - An intuitive app to display transparent images on screen.
Mokup Frames - Create amazing Dribbble-ready GIFs or videos in a few clicks
Osiva - Osiva" is an acronym that stands for "Overly Simple Image Viewing