Have you looked at https://tunnelblick.net ? - Source: Reddit / about 1 month ago
OpenVPN - OpenVPN - The Open Source VPN
WireGuard - Fast, Modern, Secure VPN Tunnel
OpenConnect - VPN client compatible with Cisco AnyConnect SSL 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.
Pritunl Client - Simple OpenVPN Client and GUI. Additional integration available when connecting to a Pritunl server.
Freelan - You are in control. Why would you trust a closed, proprietary software with your most-sensitive data ? Freelan is open-source and completely free. You know everything about its internals and its source-code.