DefGuard - True enterprise WireGuard with MFA/2FA and SSO. (Source Code) Apache-2.0Rust
Dockovpn - Out-of-the-box stateless dockerized OpenVPN server which starts in less than 2 seconds. (Source Code) GPL-2.0Docker
Firezone - WireGuard based VPN Server and Firewall. (Source Code) Apache-2.0Docker
Gluetun VPN client - VPN client in a thin Docker container for multiple VPN providers, written in Go, and using OpenVPN or Wireguard, DNS over TLS, with a few proxy servers built-in. MITdocker
Headscale - Self-hostable fork of Tailscale, cross-platform clients, simple to use, built-in (currently experimental) monitoring tools. BSD-3-ClauseGo
Nebula - A scalable p2p VPN with a focus on performance, simplicity and security. MITGo