PhotoScan

If you're over the age of, say, 20, odds are you have some old analog photo prints laying around. Instead of buying a scanner to digitize them, use the highly capable camera in your phone and the PhotoScan app from Google. It uses specialized algorithms to detect edges, correct perspective, rotate as needed, and stitch multiple exposures together to get rid of glare. It also integrates seamlessly with Google Photos, and as with nearly all software from Mountain View, it's completely free.