V2Ray - A platform for building proxies to bypass network restrictions.
ProtonVPN - ProtonVPN is a security focused FREE VPN service, developed by CERN and MIT scientists. Use the web anonymously, unblock websites & encrypt your connection.
GAppProxy - GAppProxy is an open source HTTP Proxy software runs on Google App Engine.
OpenVPN - OpenVPN - The Open Source VPN
Shadowsocks - A fast tunnel proxy that helps you bypass firewalls
TunnelBear - Really simple VPN to browse the web privately & anonymously.