Just ran across this in a tutorial.. It is called Pure-Reference and it is a virtual screen for ALL your reference images, if your modeling, rendering, sculpting whatever you need reference images for this will allow you to place them on screen manipulate, size,rotate just about anything and everything. If you have dual screens even better! But not needed..there is even a portable version available! https://www.pureref.com/index.php they request a donation.. but the program is free.. I did my part by telling all you!