VPN client and connecting to VPN server service to be able to reach the machine

Hello;

My machine is OpenSuSe version 12.3 and I need this machine to be connected with VPN service (appreciate if someone advise me for free VPN service or almost free), so it will be connected automatically once the machine booted, and then I need to be able to reach for my machine remotely using VPN. Is there something like this?

If yes, what is the VPN client to be installed at the machine and the VPN server that I can connect to it? And what is the client that I have to install it at my Windows 8 laptop to be able to connect to the VPN server to reach my machine?

Thanks for the help in advance.

Regards
Bilal