Proton VPN, developed by Proton AG in Switzerland, offers virtual private networking with a focus on privacy. It was founded by CERN scientists in 2014. The service has servers in over 140 countries (20,000+ servers), and its apps are open-source, audited, and governed by a strict no-logs policy. It also leverages Swiss privacy protections and is supported by a non-profit foundation. (The site mentions 100+ million users globally and independent audits.)