Have I Been Sold? - Check if your email address was sold without permission
Callblock - The first app to block telemarketers automatically in iOS
Creep Alert - Check if friends or colleagues track you via email
Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
Optery - See the private info data brokers post about you online
SpoofCard - Disguise your Caller ID