iVPN
iVPN is the original VPN server for non-server Macs. It uses Apple's built-in, rock solid VPN server; the same used in Mac OS X Server.
iVPN easily creates a standards-based PPTP and L2TP VPN server on your home or office Mac. With just a few details and a couple of clicks, you'll be ready to connect securely to your Mac from anywhere in the world and from nearly any device!
Catalina Bug! There is a bug in macOS 10.15 Catalina that is preventing Apple's VPN server from functioning correctly. Until Apple release a fix for this bug, iVPN will not reliably accept connections on Catalina.
In the meantime, if you are experiencing this problem yourself, the only advice I can give is to downgrade to macOS Mojave. I know this will be frustrating and I apologise for any inconvenience this may cause. Please know that I am doing everything I can to find a solution to this problem myself.