A reader wrote in to tell about his experiences with a free SSL VPN product called SSL-Explorer, which provides many of the features that commercial SSL VPN software and appliances offer.

OpenVPN is an open source SSL VPN system that supports servers and clients across several platforms. Version 1 required unique ports for individual VPN client connections.

Proton VPN and Mullvad aren’t the only open-source VPN, but they do stand out as leaders in privacy protection. Proton is located in Switzerland, which isn’t part of any intelligence alliances.

The best privacy-preserving open-source VPN - If you’re looking for a VPN with solid privacy credentials and fast speeds, ...

I compare Proton VPN Plus and Mullvad, two open-source VPNs with a strong privacy focus and fast servers worldwide, to find out which is best for you.