MyHeritage just released, free to all registered users, a photo tagger facility. Presently available on the mobile app for Android and iOS (and coming on the website), given that you’ve tagged individuals in a certain number of photos it will find them in other photos you upload through facial recognition.
Toronto-based Uri Gonen explains the feature in a 30-minute video. including some of the privacy protections the company has instituted.
In case you missed it, Ancestry last month introduced a colourization capability for black and white photos. Find out about it here.