As of 2015, the most popular free VPN service is the cross-platform Cyberghost. On BestVPN.com, Cyberghost was named the best free VPN for Windows, Mac, Linux and mobile because of its high security and lack of download limit. Other highly rated free VPNs are SurfEasy, TunnelBear and Hotspot Shield. Although these services don't have a speed limit like Cyberghost does, they have data limits and are ad-supported.
Cyberghost, like all free VPNs, is ad-supported; however it is different from most free VPNs in that there is no download limit. BestVPN.com rates Cyberghost the best free VPN provider because it has high standards for privacy and security. Cyberghost doesn't keep logs and even deletes payment details after they're processed. Cyberghost is available free for unlimited use on Windows, Mac, and mobile devices.
According to BestVPN, the second-best VPN service is SurfEasy. Surfeasy is a Canadian company, praised for having great privacy and security features. SurfEasy's free VPN has high speeds, but has a monthly data limit that can be increased by referring other users to the service. To ensure security and legality, SurfEasy doesn't support P2P clients through its VPN.
Other highly rated free VPN services are TunnelBear and Hotspot Shield. TunnelBear has high speeds, data caps and no P2P support, like SurfEasy. Hotspot Shield is a popular service for its easy to use software and lack of data cap; however, the free version only connects to U.S. servers and places ads within Web pages as well as in the client.