WireGuard - Fast, Modern, Secure VPN Tunnel
Tunnelblick - free software for OpenVPN on OS X and macOS
OpenVPN - OpenVPN - The Open Source VPN
Cisco Anyconnect Secure Mobility Client - Get much more than industry-leading VPN client connectivity. Cisco AnyConnect protects your enterprise resources through a single agent. See how.
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.
OpenConnect GUI - This is the GUI client for the OpenConnect VPN, an open-source alternative to Cisco AnyConnect.