Puff - Puff is a secure proxy software & service, it is provided AS IS without any warranty
OpenVPN - OpenVPN - The Open Source VPN
GAppProxy - GAppProxy is an open source HTTP Proxy software runs on Google App Engine.
ProtonVPN - ProtonVPN is a security focused FREE VPN service, developed by CERN and MIT scientists. Use the web anonymously, unblock websites & encrypt your connection.
XX-Net - XX-Net is GoAgent with improvements.
TunnelBear - Really simple VPN to browse the web privately & anonymously.