The easiest, most secure way to use WireGuard and 2FA
...The project includes a daemon (tailscaled) and a CLI tool that run on major operating systems, and it also forms the basis for the official clients on platforms like iOS and Android, though those have GUI wrappers not fully in this repository.
CyberGhost, a popular VPN provider around the world, does not have a GUI for Linux-based systems. But that has now changed.
Announcing CyberDog, a nifty and easy-to-use program for Linux devices, that provides a full GUI and CyberGhost's major functions.
Connect to anywhere, from anywhere, on any device.
SourceForge version most likely out of date, the program will tell you to update on a 3rd party website.
Rockhopper is IPsec/IKEv2-based VPN software for Linux. This software is interoperable with Windows 7, Windows 8 and Windows 10 VPN clients and it provides a handy AJAX-based Web console to manage Secure Virtual Ethernet(LAN), Routing-based VPN, Remote Access VPN and servers protected by IPsec. No kernel modules are needed. The ESP protocol stack is also implemented in user space.
OAST is a cross-platform front-end (GUI) for OpenVPN-client, allowing to manage multiple. It's quite simple in use and provides base functionality such as monitoring connection status. Application is written in Java so it works on both Windows and Linux
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vpnDialer is a gtk2+ gui for the vpnc package. It's a simple and easy to use program to create and disable connections. It can also be used to create and modify vpn configuration profiles.