New Google Photos - Shared suggestions, libraries and photo books
Facial Recognition by FB - Get notified if someone tries to use your photo on Facebook
Viso - Beautiful minimal image viewer for MacOS
PhotoTime - Automatic face sorting & keywords tagging for your photos
Google Photos - All your photos are backed up safely, organized and labeled automatically, so you can find them fast, and share them how you like.
Knoto - Send photos to friends automatically using face recognition