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.
OpenVPN Manager - OpenVPN Manager is a tool which controls OpenVPN.
Viscosity - Viscosity is a VPN client for Mac OS X and Windows.
Tunnelblick - free software for OpenVPN on OS X and macOS
OpenVPN MI GUI - OpenVPN MI GUI is a Windows graphical user interface for the OpenVPN client management interface.
WireGuard - Fast, Modern, Secure VPN Tunnel