Note: This question was originally posted on Software Recs, but due to lack of activity I'm reposting it here.
Windows Live Gallery had a great Photo Fuse feature that allowed you to select multiple similar photos and be able to select which faces from each photo would be used in the final composite image. This was great for group photos where in every photo someone isn't looking at the camera or blinking etc, as you can combine them all and select all the faces that are looking.
Unfortunately, Windows Live Gallery is now unsupported and unavailable for download. Is there any free software that has similar functionality (offline/online)?