ProtonVPN - ProtonVPN is a security focused FREE VPN service, developed by CERN and MIT scientists. Use the web anonymously, unblock websites & encrypt your connection.
Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
OpenVPN - OpenVPN - The Open Source VPN
CallApp - Free Caller ID & Call Blocker app that allows mobile users to block phone calls, identify calls, blacklist unwanted callers and much more.
TunnelBear - Really simple VPN to browse the web privately & anonymously.
CallerSmart - CallerSmart is an application that is basically used for the purpose of looking up mystery phone numbers for free.