Windows/Mac: Chances are you've received your fair share of photos as email attachments over the years, and you've probably lost track of at least some of them. You could scrounge through your inbox for those long-lost attachments, or you can let Lost Photos do all the work for you.
All you need to do is sign in with your email address, and Lost Photos will scrub your inbox for photographs. Once it has finished its search, it will show you the photos it has found in a simple slide format that's easy to browse quickly. You can also share the photos directly to social networks or save them to your hard drive. Lost Photos is a $US2.99 app for both Windows and Mac.