A simple API for local and remote SSH port forwarding (tunneling) has been added in Rebex Terminal Emulation 2016 R1. Check out some sample code, and sorry for the long wait!
The SSH functionality required to make this possible is already included in both Rebex SFTP and Rebex SSH Shell and can be used to implement a Tunnelier-like application, but we have yet to add a simple API to make this easy. This is planned for one of the future releases.
If you don't want to wait, download our SshTunnel sample application (C# and VB.NET) and give it a try - it uses the current version of Rebex SFTP or SSH Shell to tunnel connections from the specified local port through the specified SSH server to the specified target IP address and port.
The application forwards all traffic from the IP/port in the "Local" field (127.0.0.1:8080 by default) to IP/port in the "Remote" field (22.214.171.124:80 by default). The default tunnelling setting tunnels connections to port 8080 to port 80 of google.com, making it possible to connect to Google through the specified SSH server by typing http://localhost:8080/ in the local web browser. Replacing Google's IP/port (126.96.36.199) will make it tunnel to a different address.
C# and VB.NET source code is included with the sample application. The two classes in Tunnel.cs are the sample core. Any feedback is welcome!