This is a service I've built to provide equirectangular cloud maps of the whole Earth, updated every 3 hours, for free.
It's based on infrared and visible light data from EUMETSAT, processed to enhance the clouds and try to reduce the impact of surface temperatures on the final image.
I built it because it's surprisingly hard to find these kinds of images in a format that's useful to developers and hobbyists. I was building a 3D ISS tracker and wanted to include live clouds but couldn't find anything good, so I got sidetracked, and here we are.
Don't have any particular use case for this, myself, but its open accessibility (a simple url) makes it a drop in solution for all kinds of environments, including Unreal and Blender. And just based on what those two apps can do with it, I bet there are a bunch of others that can do some other really awesome stuff with it, too!