Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
CThruView Transparent Image Viewer - CThruView is a free transparent image viewer that allows mouse clicks to go through the image.
Invision - Prototyping and collaboration for design teams
PixelPerfect - Allows developers to put a semi-transparent image overlay over the top of the developed HTML and...
Sketch - Professional digital design for Mac.
Osiva - Osiva" is an acronym that stands for "Overly Simple Image Viewing