PortTunnel is a TCP/IP port redirector with logging. Features include: IP security, tunnel most TCP connections out through proxies, translate FTP 'PORT' and 'PASV' commands, sFTP (FTP over SSL/TLS), SSL/TLS support using OpenSSL, SMTP relay filtering, runs as a service on all versions of Windows, log all data, great for debugging network programs, and it can redirect many ports at once.
More info:
hxxp://www.steelbytes.com/