Secure Shell (SSH) is a secure version of Telnet that you can use to log on and open a command line on a remote machine. You can also use SSH to establish an encrypted tunnel between two machines, effectively creating a VPN. Different versions of SSH use RSA or Digital Signature Algorithm (DSA) for secure key exchange and 3DES or Blowfish for data encryption. You can use a free program such as Stunnel (http://www.stunnel.org) along with a free version of SSH such as OpenSSH (http://www.openssh.org) to tunnel protocols such as Web and mail protocols through an encrypted SSH tunnel. All you need is a machine at either end running both these programs. SSH and Stunnel are an inexpensive way to implement a VPN, although setting up such a VPN requires a lot of configuration and might not scale to handle a large number of machines. An SSH VPN can, however, make a nice solution for connecting two servers that need to communicate securely, such as a Web server and a back-end database server.
We're slightly surprised that ExpressVPN wasn't #1 in the rankings, as Reddit users really seem to love it (or as close to love as you can get with the ultra picky Reddit community). If you do a Reddit search on any other VPN, someone in the comments will say Express is better. At first glance, it already looks a lot more user friendly and a lot more trustworthy than PureVPN. In his ExpressVPN review, Redditor bigkenw writes: