Yggdrasil - A proof-of-concept scalable IPv6 meshnet, featuring end-to-end encryption, a unique spanning tree...
OpenVPN - OpenVPN - The Open Source VPN
Bitmask - Bitmask is an open source application to provide easy and secure encrypted communication.
ProtonVPN - ProtonVPN is a security focused FREE VPN service, developed by CERN and MIT scientists. Use the web anonymously, unblock websites & encrypt your connection.
FreePN - FreePN is the first open-source peer-to-peer VPN service. It's also fast, secure, and completely free.
TunnelBear - Really simple VPN to browse the web privately & anonymously.