Tunnelblick - free software for OpenVPN on OS X and macOS
ProtonVPN - ProtonVPN is a security focused FREE VPN service, developed by CERN and MIT scientists. Use the web anonymously, unblock websites & encrypt your connection.
OpenVPN - OpenVPN - The Open Source VPN
WireGuard - Fast, Modern, Secure VPN Tunnel
TunnelBear - Really simple VPN to browse the web privately & anonymously.
Firezone - Firezone is a remote access platform that’s painless to deploy, easy to manage, and built on WireGuard® to be blazing fast. Best of all it's self-hosted and open-source.