Proton VPN is, as the name indicates, a VPN service that secures your online activities. The service offers four subscription plans - the first plan being completely free. The VPN service is extremely popular. In fact, the free version is no more available since it has been oversubscribed. New users would have to join a waitlist, as a result. The highest plan comes with a ProtonMail account. For people who aren't completely convinced about the benefits of ProtonVPN Plus, there's a 7-day free trial to test things out.