Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
Have I Been Sold? - Check if your email address was sold without permission
Hiya - Know who's calling or texting and block spammers on Android
Creep Alert - Check if friends or colleagues track you via email
Credo360 - Figure out who to trust by looking at a social credit score
Optery - See the private info data brokers post about you online