VPNReactor offers a free PPTP server for registered members to connect. However, there are some notable restrictions. For started you can only be connected to the server for 30 minutes at a time. Then you must wait at least 30 minutes to reconnect. For that reason it’s a decent way to test a VPNReactor PPTP server but otherwise only useful for short periods.
Update: In addition to the free PPTP account with restrictions, VPNReactor is offering 7 day free trials with paid sign ups.
The VPNReactor free trial does not require a coupon code. To enjoy the free VPN access simply visit the VPNReactor site and sign up. Either for a free PPTP account (with 30 minute time restriction) or a premium paid account which includes a 7 day free trial (money back guarantee).