Spoolmac is described as 'Peer to peer cloud supercomputer, free VPN' and is an app in the File Sharing category. There are four alternatives to Spoolmac for a variety of platforms, including Linux, Mac, Windows, Android and Android Tablet. The best alternative is LogMeIn Hamachi, which is free. Other great apps like Spoolmac are IPOP (IP-over-P2P) (Free, Open Source), OpenVPN Finder (Free, Open Source) and NetOverNet (Freemium).
LogMeIn Hamachi is a hosted VPN service that securely connects devices and networks, extending LAN-like network connectivity to mobile users, distributed teams and business applications. You can easily create secure virtual networks on demand, across public and private networks.
This simple tool finds free OpenVPN servers for you and allow you to download the OVPN config file. The extension is written on top of VPN Gate Academic Experiment Project that is an online service as an academic research at Graduate School of University of Tsukuba, Japan.