Although there are many free services, most of them have very less monthly bandwidth. SecurityKISS is an awesome free VPN service for Windows which offer best features. SecurityKISS Tunnel is a VPN implementation based on OpenVPN. Once of the unique features of the app is that its very simple to use and does not require any registration or user account.
All you need to do is to start the app and click on the connect button and the app connects to the VPN. The service provides you with 300 MB per day in the free plan. Although the free usage is small for a full time internet user, it still is very good compared to other free VPN services. We checked the speed available and it was really good.
The best feature of this VPN is the ease with which you can get started with the service. You can also change the VPN server using the app interface.
The free version has five servers listed, with 2 in US and UK and one in Germany.
Overall SecurityKISS service was pretty good.
Download SecurityKISS here:
http://www.securitykiss.com/