PortTunnel 2.0.43.451 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The most popular versions of the tool are 2.0 and 1.6. The actual developer of the program is SteelBytes. The program's installer file is generally known as PortTunnel.exe. The software lies within Internet & Network Tools, more precisely Network Tools. We recommend checking the downloaded files with any free antivirus.
From the developer:
TCP/IP port redirector with many features for the advanced user.
You may want to check out more software, such as Port Tunnel Wizard, which might be related to PortTunnel.