OpenSSH - OpenSSH is a free version of the SSH connectivity tools that technical users rely on.
socat - socat is a relay for bidirectional data transfer between two independent data channels.
MobaSSH - Enhanced SSH server for Windows with Unix tools and much more
Komodia Relay - Free open source tool to perform TCP based session relay
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
AUTAPF - Reliable TCP and UDP port forwarding for Windows.