VPN

Virtual Private Network -VPN

open source

Open VPN

https://openvpn.net/

SoftEther

https://www.softether.org/

Tinc

https://www.tinc-vpn.org/

Openswan

https://www.openswan.org/

Libreswan

https://libreswan.org/

strongSwan

https://www.strongswan.org/

OpenConnect

http://www.infradead.org/openconnect/

Freelan

https://www.freelan.org/

printunl

https://pritunl.com/

Openconnect VPN Server

http://ocserv.gitlab.io/www/index.html

sshuttle

https://github.com/sshuttle/sshuttle

perrvpn

https://peervpn.net/

Reference

https://en.wikipedia.org/wiki/Virtual_private_network

https://searchnetworking.techtarget.com/definition/virtual-private-network

https://opensource.com/article/18/6/vpn-alternatives

https://www.geckoandfly.com/5710/free-vpn-for-windows-mac-os-x-linux-iphone-ubuntu/

https://www.drfone.biz/vpn/open-source-vpn.html

http://cybersafetrick.com/open-source-vpn/