From: https://kevinzy.wordpress.com/tag/lan/

NeoRouter uses a different strategy – It allows users to setup their own server and it provides P2P 
service as well. This does help me a lot. When at my home, it can create P2P connections; when I am 
at my office, the NeoRouter server works as a relay server to redirect the traffic to other computers.

Recently, NeoRouter has just released in-a-box version for OpenWrt and Tomato firmware. That means I 
can turn my Linksys WRT54GL router into a SSL VPN server.

From: http://www.neorouter.com/products-nrfree

NeoRouter is a cross-platform zero-configuration VPN solution that securely connects Windows, 
Mac, Linux and FreeBSD computers at any locations into a virtual LAN and provides a networking 
platform for various applications like remote desktop, shared folders and printers, offsite backup, 
voice & video chat, etc..

NeoRouter Free features bleeding-edge technologies and is released frequently. It is 100% free for 
both commercial and non-commercial usage. Try it free for up to 256 devices.

Also: http://www.thewindowsclub.com/neorouter-vpn-software

From: http://www.softether.org/

SoftEther VPN ("SoftEther" means "Software Ethernet") is one of the world's most powerful and 
easy-to-use multi-protocol VPN software. It runs on Windows, Linux, Mac, FreeBSD and Solaris.
SoftEther VPN is open source. You can use SoftEther for any personal or commercial use for 
free charge.
SoftEther VPN is an optimum alternative to OpenVPN