STunnel - Stunnel is a proxy designed to add TLS encryption functionality to existing clients and servers without any changes in the programs' code.
GoAgent - GoAgent is a gae proxy forked from gappproxy/wallproxy.
gobetween - Modern & minimalistic load balancer and router for the Cloud era
ProtonVPN - ProtonVPN is a security focused FREE VPN service, developed by CERN and MIT scientists. Use the web anonymously, unblock websites & encrypt your connection.
Haproxy - Reliable, High Performance TCP/HTTP Load Balancer
XX-Net - XX-Net is GoAgent with improvements.