Proton VPN is a mainstay in pretty much most, if not all, of our best VPN lists. It was launched in 2014 by a group of scientists that met at CERN, and it's based in Switzerland.
The company's main ethos is that "privacy is a human right," reflected by the fact that Proton continues to offer a free VPN service alongside its paid plan – something only a handful of VPNs do. Aside from the privacy-focused VPN service, Proton is also known for its secure mail service, Proton Mail, and a few other related products.